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.
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).
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 newγ
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 τSco. 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