Homepage of Asif ud-Doula

Current Position

Currently, I am an Associate Professor of Physics at Penn State Scranton campus located in Dunmore, North East Pennsylvania. I teach both physics and astronomy courses. My primary research is in astrophysics, massive stars in particular. Any interested student may contact me to pursue a research project.

Current Research

I have created a separate webpage that discusses my current research. U

Current Teaching

Click here to access the pages for current courses I am teaching..

PhD Research

I was a graduate student at the Department of Physics and Astronomy (DPA) of the University of Delaware. I completed my PhD (Fall 2002) under the advisement of Prof. Stan Owocki, a faculty member at Bartol Research Institute which holds joint PhD program with DPA. The subject of my thesis was the effect of rotation and magnetic fields on the winds of hot stars, stars of type so called O and B.

PhD Thesis

You can downolad a complete pdf version of my thesis (ca 25 MB) which can be used as an introduction to line-driven hot-star winds. If you are making a hard copy, you might have difficulties printing some of the large color-scale figures, in which case print them separately. For those with slow links, I put a copy of the thesis without figures (0.5 MB).

Curriculum Vitae (CV)

You can download my CV in pdf version.

Refereed Journal Publications:

ud-Doula, A. (2017). Magnetic fields in massive stars and magnetically confined winds. Astronomische Nachrichten, 338, 944-951.

Petit, V., Keszthelyi, Z., MacInnis, R., Cohen, D.H., Townsend, R.H.D., Wade, G.A., Thomas, S.L., Owocki, S.P., Puls, J., & ud-Doula, A. (Author, 10%) (2017). Magnetic massive stars as progenitors of ‘heavy’ stellar-mass black holes. Monthly Notices of the Royal Astronomical Society, 466, 1052-1060.

Kurapati, S., Chandra, P., Wade, G., Cohen, D.H., David-Uraz, A., Gagne, M., Grunhut, J., Oksala, M.E., Petit, V., Shultz, M., Sundqvist, J., Townsend, R.H.D., & ud-Doula, A. (Author, 10%) (2017). A JVLA survey of the high-frequency radio emission of the massive magnetic B- and O-type stars. Monthly Notices of the Royal Astronomical Society, 465, 2160-2169.

Nazé, Y., ud-Doula, A. (Author, 35%), & Zhekov, S.A. (2016). Chandra View of Magnetically Confined Wind in HD191612: Theory Versus Observations. The Astrophysical Journal, 831, 138.

Owocki, S.P., ud-Doula, A. (Author, 30%), Sundqvist, J.Õ., Petit, V., Cohen, D.H., & Townsend, R.H.D. (2016). An ‘Analytic Dynamical Magnetosphere’ formalism for X-ray and optical emission from slowly rotating magnetic massive stars. Monthly Notices of Royal Astronomical Society, 462(4), 3830-3844.

Privitera, G., Meynet, G., Eggenberger, P., Georgy, C., Ekström, S., Vidotto, A.A., Bianda, M., Villaver, E., & ud-Doula, A. (Author, 10%) (2016). High surface magnetic field in red giants as a new signature of planet engulfment? Astronomy & Astrophysics, 593, L15.

ud-Doula, A. (Author, 50%), & Nazé, Y. (2016). Magnetically confined wind shocks in X-rays - A review. Advances in Space Research, 58, 680-693.

Wade, G.A., Neiner, C., Alecian, E., Grunhut, J.H., Petit, V., Batz, B.d., Bohlender, D.A., Cohen, D.H., Henrichs, H.F., Kochukhov, O., Landstreet, J.D., Manset, N., Martins, F., Mathis, S., Oksala, M.E., Owocki, S.P., Rivinius, T., Shultz, M.E., Sundqvist, J.Õ., Townsend, R.H.D., ud-Doula, A. (Author, 3%), Bouret, J.-C., Braithwaite, J., Briquet, M., Carciofi, A.C., David-Uraz, A., Folsom, C.P., Fullerton, A.W., Leroy, B., Marcolino, W.L.F., Moffat, A.F.J., Nazé, Y., Louis, N.S., Aurière, M., Bagnulo, S., Bailey, J.D., Barbá, R.H., Blazère, A., Böhm, T., Catala, C., Donati, J.-F., Ferrario, L., Harrington, D., Howarth, I.D., Ignace, R., Kaper, L., Lüftinger, T., Prinja, R., Vink, J.S., Weiss, W.W., & Yakunin, I. (2016). The MiMeS survey of magnetism in massive stars: introduction and overview. Monthly Notices of the Royal Astronomical Society, 456, 2-22.

Petit, V., & ud-Doula, A. (Author, 10%), et al. (2015). X-ray emission from the giant magnetosphere of the magnetic O-type star NGC1624-2. Monthly Notices of Royal Astronomical Society.

Nazé, Y., Sundqvist, J.Õ., Fullerton, A.W., ud-Doula, A. (Author, 20%), Wade, G.A., Rauw, G., & Walborn, N.R. (2015). The changing UV and X-ray properties of the Of?p star CPD -282561. Monthly Notices of the Royal Astronomical Society, 452, 2641-2653.

Sikora, J., Wade, G.A., Bohlender, D.A., Neiner, C., Oksala, M.E., Shultz, M., Cohen, D.H., ud-Doula, A. (Author, 8%), Grunhut, J., Monin, D., Owocki, S., Petit, V., Rivinus, T., & Townsend, R.H.D. (2015). Confirming HD 23478 as a new magnetic B star hosting an Halpha-bright centrifugal magnetosphere. Monthly Notices of the Royal Astronomical Society, 451, 1928-1938.

Chandra, P., Wade, G.A., Sundqvist, J.Õ., Oberoi, D., Grunhut, J.H., ud-Doula, A. (Author, 10%), Petit, V., Cohen, D.H., Oksala, M.E., & David-Uraz, A. (2015). Detection of 610-MHz radio emission from hot magnetic stars. Monthly Notices of the Royal Astronomical Society, 453, 1245-1253.

Wade, G.A., Barbá, R.H., Grunhut, J., Martins, F., Petit, V., Sundqvist, J.Õ., Townsend, R.H.D., Walborn, N.R., Alecian, E., Alfaro, E.J., Maíz Apellániz, J., Arias, J.I., Gamen, R., Morrell, N., Nazé, Y., Sota, A., ud-Doula, A. (Author, 7%), & MiMeS Collaboration (2015). Rotation, spectral variability, magnetic geometry and magnetosphere of the Of?p star CPD -28 2561. Monthly Notices of the Royal Astronomical Society, 447, 2551-2567.

Gómez de Castro, A.I., Appourchaux, T., Barstow, M.A., Barthelemy, M., Baudin, F., Benetti, S., Blay, P., Brosch, N., Bunce, E., de Martino, D., Deharveng, J.-M., Ferlet, R., France, K., García, M., Gänsicke, B., Gry, C., Hillenbrand, L., Josselin, E., Kehrig, C., Lamy, L., Lapington, J., Lecavelier des Etangs, A., LePetit, F., López-Santiago, J., Milliard, B., Monier, R., Naletto, G., Nazé, Y., Neiner, C., Nichols, J., Orio, M., Pagano, I., Peroux, C., Rauw, G., Shore, S., Spaans, M., Tovmassian, G., ud-Doula, A. (Co-Author, 5%), & Vilchez, J. (2014). Building galaxies, stars, planets and the ingredients for life between the stars. The science behind the European Ultraviolet-Visible Observatory. Astrophysics & Space Science, 354, 229-246.

Neiner, C., Baade, D., Fullerton, A., Gry, C., Hussain, G., Lèbre, A., Morin, J., Petit, P., Sundqvist, J.Õ., ud-Doula, A. (Author, 10%), Vidotto, A.A., & Wade, G.A. (2014). UVMag: stellar formation, evolution, structure and environment with space UV and visible spectropolarimetry. Astrophysics & Space Science, 354, 215-227.

Nazé, Y., Petit, V., Rinbrand, M., Cohen, D., Owocki, S., ud-Doula, A. (Author, 15%), & Wade, G.A. (2014). X-Ray Emission from Magnetic Massive Stars. The Astrophysical Journal, Supplement, 215, 10.

David-Uraz (Graduate Student), A., Wade, G.A., Petit, V., ud-Doula, A. (Author, 10%), Sundqvist, J.Õ., Grunhut, J., Shultz, M., Neiner, C., Alecian, E., Henrichs, H.F., Bouret, J.-C., & MiMeS Collaboration (2014). Investigating the origin of cyclical wind variability in hot, massive stars - I. On the dipolar magnetic field hypothesis. Monthly Notices of the Royal Astronomical Society, 444, 429-442.

ud-Doula, A. (Primary Author, 70%), Owocki, S., Townsend, R., Petit, V., & Cohen, D. (2014). X-rays from magnetically confined wind shocks: effect of cooling-regulated shock retreat. Monthly Notices of the Royal Astronomical Society, 441, 3600-3614.

Owocki, S., ud-Doula, A. (Author, 30%), & Kee (Graduate Student), N.D. (2014). Suppression of X-rays from radiative shocks by their thin-shell instability. Monthly Notices of the Royal Astronomical Society, 438, 3557-3567.

Rauw, G., Nazé, Y., Spano, M., Morel, T., & ud-Doula, A. (Author, 15%) (2013). HD 45314: a new γ Cassiopeiae analog among Oe stars. Astronomy & Astrophysics, 555, L9.

Marcolino, W.L.F., Bouret, J.-C., Sundqvist, J.Õ., Walborn, N.R., Fullerton, A.W., Howarth, I.D., Wade, G.A., & ud-Doula, A. (Co-Author, 5%) (2013). Phase-resolved ultraviolet spectroscopy of the magnetic Of?p star HD 191612. Monthly Notices of the Royal Astronomical Society, 431, 2253-2260.

Petit, V., Owocki, S.P., Wade, G.A., Cohen, D.H., Sundqvist, J.Õ., Gagné, M., Maíz Apellániz, J., Oksala, M.E., Bohlender, D.A., Rivinius, T., Henrichs, H.F., Alecian, E., Townsend, R.H.D., ud-Doula, A. (Co-Author, 5%), & MiMeS Collaboration (2013). A magnetic confinement versus rotation classification of massive-star magnetospheres. Monthly Notices of the Royal Astronomical Society, 429, 398-422.

ud-Doula, A. (Primary Author, 65%), Sundqvist, J.Õ., Owocki, S.P., Petit, V., & Townsend, R.H.D. (2013). First 3D MHD simulation of a massive-star magnetosphere with application to Hα emission from θ1 Ori C. Monthly Notices of the Royal Astronomical Society, 428, 2723-2730.

Neiner, C., Grunhut, J.H., Petit, V., ud-Doula, A. (Author, 15%), Wade, G.A., Landstreet, J., de Batz, B., Cochard, F., Gutiérrez-Soto, J., & Huat, A.-L. (2012). An investigation of the magnetic properties of the classical Be star ω Ori by the MiMeS Collaboration. Monthly Notices of the Royal Astronomical Society, 426, 2738-2750.

Grunhut, J.H., Wade, G.A., Sundqvist, J.Õ., ud-Doula, A. (Author, 10%), Neiner, C., Ignace, R., Marcolino, W.L.F., Rivinius, T., Fullerton, A., Kaper, L., Mauclaire, B., Buil, C., Garrel, T., Ribeiro, J., & Ubaud, S. (2012). Investigating the spectroscopic, magnetic and circumstellar variability of the O9 subgiant star HD 57682. Monthly Notices of the Royal Astronomical Society, 426, 2208-2227.

Sundqvist, J.Õ., ud-Doula, A. (Author, 35%), Owocki, S.P., Townsend, R.H.D., Howarth, I.D., & Wade, G.A. (2012). A dynamical magnetosphere model for periodic Hα emission from the slowly rotating magnetic O star HD 191612. Monthly Notices of the Royal Astronomical Society, 423, L21-L25.

Curé, M., Santillán, A., ud-Doula, A. (Author, 25%), & Araya (Graduate Student), I. (2011). Soluciones a modelos hidrodinámicos de vientos estelares en estrellas masivas. Boletin de la Asociacion Argentina de Astronomia La Plata Argentina, 54, 125-128.

Wade, G.A., Howarth, I.D., Townsend, R.H.D., Grunhut, J.H., Shultz, M., Bouret, J.-C., Fullerton, A., Marcolino, W., Martins, F., Nazé, Y., ud-Doula, A. (Co-Author, 5%), Walborn, N.R., & Donati, J.-F. (2011). Confirmation of the magnetic oblique rotator model for the Of?p star HD 191612. Monthly Notices of the Royal Astronomical Society, 416, 3160-3169.

Townsley, L. K., Broos, P.S., Corcoran, M.F., Feigelson, E.D., Gagné, M., Montmerle, T., Oey, M.S., Smith, N., Garmire, G.P., Getman, K.V., Povich, M.S., Remage Evans, N., Nazé, Y., Parkin, E.R., Preibisch, T., Wang, J., Wolk, S.J., Chu, Y.-H., Cohen, D.H., Gruendl, R.A., Hamaguchi, K., King, R.R., Mac Low, M.-M., McCaughrean, M.J., Moffat, A.F.J., Oskinova, L.M., Pittard, J.M., Stassun, K.G., ud-Doula, A. (Co-Author, 2%), Walborn, N.R., Waldron, W.L., Churchwell, E., Nichols, J.S., Owocki, S.P., & Schulz, N.S. (2011). An Introduction to the Chandra Carina Complex Project. The Astrophysical Journal, Supplement, 194, 1.

Nazé, Y., Broos, P.S., Oskinova, L., Townsley, L. K., Cohen, D., Corcoran, M.F., Evans, N.R., Gagné, M., Moffat, A.F.J., Pittard, J.M., Rauw, G., ud-Doula, A. (Co-Author, 5%), & Walborn, N.R. (2011). Global X-ray Properties of the O and B Stars in Carina. The Astrophysical Journal, Supplement, 194, 7.

Ignace, R., Oskinova, L. M., Jardine, M., Cassinell, J., Cohen, D. H., Donati, J.-F., Townsend, R. H.D., & ud-Doula, A. (Author, 10%) (2010). A Multiphase Suzaku Study of X-rays from τ Sco. The Astrophysical Journal, 721(2), pp. 1412-1420.

Naze, Y., ud-Doula, A. (Author, 35%), Spano, M., Rauw, G., de Becker, M., & Walborn, N. R. (2010). New findings on the prototypical Of?p stars. Astronomy & Astrophysics, 520(A59), pp. 10.

Townsend, R. H.D., Oksala, M. E., Cohen, D. C., Owocki, S. P., & ud-Doula, A. (Author, 10%) (2010). Discovery of Rotational Braking in the Magnetic Helium-strong Star Sigma Orionis E. The Astrophysical Journal, 714(2), pp. L318-L322.

Naze, Y., Rauw, G., & ud-Doula, A. (Author, 20%) (2010). Hot and cool: two emission-line stars with constrasting behaviours in the same XMM-Newton field. Astronomy & Astrophysics, 510(A59).

ud-Doula, A. (Primary Author, 70%), Owocki, S.P., & Townsend, R.H.D. (2009). Dynamical simulations of magnetically channelled line-driven stellar winds - III. Angular momentum loss and rotational spin-down. Monthly Notices of the Royal Astronomical Society, 392, 1022-1033.

ud-Doula, A. (Primary Author, 70%), Owocki, S.P., & Townsend, R.H.D. (2008). Dynamical simulations of magnetically channelled line-driven stellar winds - II. The effects of field-aligned rotation. Monthly Notices of the Royal Astronomical Society, 385, 97-108.

Townsend, R.H.D., Owocki, S.P., & ud-Doula, A. (Author, 25%) (2007). A Rigid-Field Hydrodynamics approach to modelling the magnetospheres of massive stars. Monthly Notices of the Royal Astronomical Society, 382, 139-157.

Owocki, S., Townsend, R., & ud-Doula, A. (Author, 30%) (2007). Modeling the magnetospheres of luminous stars: Interactions between supersonic radiation-driven winds and stellar magnetic fields. Physics of Plasmas, 14(5), 056502.

Hayes, J.C., Norman, M.L., Fiedler, R.A., Bordner, J.Õ., Li, P.S., Clark, S.E., ud-Doula, A. (Author, 15%), & Mac Low, M.-M. (2006). Simulating Radiating and Magnetized Flows in Multiple Dimensions with ZEUS-MP. The Astrophysical Journal, Supplement, 165, 188-228.

ud-Doula, A. (Primary Author, 70%), Townsend, R.H.D., & Owocki, S.P. (2006). Centrifugal Breakout of Magnetically Confined Line-driven Stellar Winds. The Astrophysical Journal, Letters, 640, L191-L194.

Gagné, M., Oksala, M.E., Cohen, D.H., Tonnesen, S.K., ud-Doula, A. (Author, 10%), Owocki, S.P., Townsend, R.H.D., & MacFarlane, J.J. (2005). Chandra HETGS Multiphase Spectroscopy of the Young Magnetic O Star θ1 Orionis C. The Astrophysical Journal, 628, 986-1005.

Owocki, S.P., & ud-Doula, A. (Author, 50%) (2004). The Effect of Magnetic Field Tilt and Divergence on the Mass Flux and Flow Speed in a Line-driven Stellar Wind. The Astrophysical Journal, 600, 1004-1015.

Kramer, R.H., Tonnesen, S.K., Cohen, D.H., Owocki, S.P., ud-Doula, A. (Author, 10%), & MacFarlane, J.J. (2003). X-ray emission line profile modeling of hot stars. Review of Scientific Instruments, 74, 1966-1968.

Owocki, S.P., & ud-Doula, A. (Author, 75%) (2002). Dynamical Simulations of Magnetically Channeled Line-driven Stellar Winds. I. Isothermal, Nonrotating, Radially Driven Flow. The Astrophysical Journal, 576, 413-428.

Gunner, M. R., Saleh, M. A., Cross, E., ud-Doula, A. (Author, 20%), & Wise, M. (2000). Backbone Dipoles Generate Positive Potentials in all Proteins: Origins and Implications of the Effect. Biophysical journal, 78(3), 1126-44. ISBN/ISSN #/Case #/DOI #: 0006-3495