J/ApJ/938/46 Cataclysmic variable orb. periods from Gaia phot. (Abrahams+, 2022)
Informing the cataclysmic variable sequence from Gaia data: the orbital-period-
color-absolute-magnitude relationship.
Abrahams E.S., Bloom J.S., Szkody P., Rix H.-W., Mowlavi N.
<Astrophys. J., 938, 46 (2022)>
=2022ApJ...938...46A 2022ApJ...938...46A
ADC_Keywords: Binaries, cataclysmic; Stars, variable; Magnitudes, absolute;
Colors; Optical; Surveys
Keywords: Cataclysmic variable stars ; Variable stars ; Surveys ;
Hertzsprung Russell diagram ; Close binary stars
Abstract:
The orbital-period (Porb) gap in the population of cataclysmic
variables (CVs) informs the theoretical narrative of CV evolution, yet
a complete understanding of the driving angular momentum loss
mechanisms above and below this gap remains elusive. Here we identify,
for standard CVs, a new, apparently monotonic relationship between
quiescent color (GBP-GRP), absolute magnitude (MG), and Porb
(between 70 minutes and 8hr) revealed in Gaia DR2 and EDR3. We show
that Porb increases in the color-absolute-magnitude diagram roughly
orthogonally to the white dwarf and main sequences. We find the
orbital-period-color-absolute-magnitude relationship to be stable
across different CV subtypes: dwarf novae, intermediate polars,
polars, and novalike systems. We place our findings in context with
the known semiempirical donor sequence for CVs and find a dependence
between color and MG for a given Porb specifically for dwarf novae and
intermediate polars above the period gap. These relations have the
potential to inform a more complete picture of CV evolution.
Description:
We select all sources labeled as a cataclysmic variable (CV),
including subtypes, with certainty from the International Variable
Star Index (VSX; Watson+ 2006SASS...25...47W 2006SASS...25...47W, B/vsx). We crossmatch
the VSX CVs to Gaia EDR3 (I/350). See Section 2.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 92 623 CVs from VSX with a robust Gaia crossmatch
--------------------------------------------------------------------------------
See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)
J/ApJS/194/28 : The evolution of cataclysmic variables (Knigge+, 2011)
J/other/NewA/34.234 : Gal. cataclysmic variables distances (Ozdonmez+, 2015)
J/AJ/154/252 : A VLA survey of magnetic CVs. I. The data (Barrett+, 2017)
J/MNRAS/492/L40 : Disentangling cataclysmic var. in Gaia DR2 (Abril+, 2020)
J/A+A/649/A6 : Gaia Cat. of Nearby Stars - GCNS (Gaia collaboration, 2021)
J/MNRAS/504/2420 : Close white dwarf binaries - Ref. samples (Inight+, 2021)
J/A+A/648/A44 : Large-amplitude variables in Gaia DR2 (Mowlavi+, 2021)
J/A+A/649/A3 : Gaia EDR3 photometric passbands (Riello+, 2021)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaEDR3 Gaia EDR3 source identifier
21- 39 I19 --- GaiaDR2 Gaia DR2 source identifier (does not seem
right; ignored in VizieR by the CDS)
41- 69 A29 --- VSX VSX catalog identifier
71- 76 F6.4 h Porb [1.1/8] Orbital period
78- 84 F7.4 mag GMag [2.59/12.6] Gaia EDR3 G band absolute
magnitude, MG
86- 92 F7.4 mag BP-RP [-0.22/2.5] Gaia EDR3 (BP-RP) color index
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Aug-2024