Optical Studies of Seven Bright Southern Cataclysmic Variable Stars. (arXiv:2307.07630v1 [astro-ph.SR])

Optical Studies of Seven Bright Southern Cataclysmic Variable Stars. (arXiv:2307.07630v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Thorstensen_J/0/1/0/all/0/1">John R. Thorstensen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Alvarado_Anderson_C/0/1/0/all/0/1">Chase K. Alvarado-Anderson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Burrows_A/0/1/0/all/0/1">Abigail D. Burrows</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Goebel_Bain_R/0/1/0/all/0/1">Rowan M. Goebel-Bain</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Katz_D/0/1/0/all/0/1">David C. Katz</a>

We report spectroscopic observations of seven bright southern cataclysmic
variable stars, collected on a single two-week observing run using the 1.9-m
Radcliffe telescope at the South African Astronomical Observatory. We used
radial velocity time series, in some cases in combination with other data, to
determine or clarify orbital periods for five of them, namely ATO
J061.1478-31.0634, BMAM-V547, MGAB-V202, NSV 4202, and V1147 Cen. For
BMAM-V547, we use data from the Transiting Exoplanet Survey Satellite (TESS) to
corroborate and sharpen the orbital period; the TESS data also show a
photometric period near 3.93 d, likely indicating precession of the accretion
disk. Also, we find a periodic modulation in the radial velocities of the SU
UMa-type dwarf nova Var Ret2005, but are unable to specify a unique cycle
count. Finally, we show a spectrum of ASASSN-V J061528.41-412007.3 that appears
typical of a luminous novalike variable.

We report spectroscopic observations of seven bright southern cataclysmic
variable stars, collected on a single two-week observing run using the 1.9-m
Radcliffe telescope at the South African Astronomical Observatory. We used
radial velocity time series, in some cases in combination with other data, to
determine or clarify orbital periods for five of them, namely ATO
J061.1478-31.0634, BMAM-V547, MGAB-V202, NSV 4202, and V1147 Cen. For
BMAM-V547, we use data from the Transiting Exoplanet Survey Satellite (TESS) to
corroborate and sharpen the orbital period; the TESS data also show a
photometric period near 3.93 d, likely indicating precession of the accretion
disk. Also, we find a periodic modulation in the radial velocities of the SU
UMa-type dwarf nova Var Ret2005, but are unable to specify a unique cycle
count. Finally, we show a spectrum of ASASSN-V J061528.41-412007.3 that appears
typical of a luminous novalike variable.

http://arxiv.org/icons/sfx.gif