J/AJ/160/151 RVs of 5 cataclysmic variable candidates (Thorstensen, 2020)
Follow-up studies of five cataclysmic variable candidates discovered by LAMOST.
Thorstensen J.R.
<Astron. J., 160, 151 (2020)>
=2020AJ....160..151T 2020AJ....160..151T
ADC_Keywords: Stars, variable; Spectra, optical; Radial velocities
Keywords: Cataclysmic variable stars ; Nova-like variable stars ;
Eclipsing binary stars
Abstract:
We report follow-up observations of five cataclysmic variable
candidates from the Large Sky Area Multi-Object Fiber Spectroscopic
Telescope (LAMOST) published by Hou et al. LAMOSTJ024048.51+195226.9
is the most unusual of the five; an early-M type secondary star
contributes strongly to its spectrum, and its spectral and photometric
behavior are strikingly reminiscent of the hitherto-unique propeller
system AE Aqr. We confirm that a 7.34hr period discovered in the
Catalina survey data is orbital. Another object,
LAMOSTJ204305.95+341340.6, appears to be a near twin of the novalike
variable V795Her, with an orbital period in the so-called 2-3hr "gap."
LAMOSTJ035913.61+405035.0 is evidently an eclipsing, weakly
outbursting dwarf nova with a 5.48hr period. Our spectrum of
LAMOSTJ090150.09+375444.3 is dominated by a late-type secondary and
shows weak, narrow Balmer emission moving in phase with the absorption
lines, but at lower amplitude; we do not see the HeII λ4686
emission evident in the published discovery spectrum. We again confirm
that a period from the Catalina data, in this case 6.80hr, is orbital.
LAMOSTJ033940.98+414805.7 yields a radial-velocity period of 3.54hr,
and its spectrum appears to be typical of novalike variables in this
period range. The spectroscopically selected sample from LAMOST
evidently includes some interesting cataclysmic variables that have
been unrecognized until now, apparently because of the relatively
modest range of their photometric variations.
Description:
All the data presented here were taken in 2019 December and 2020
January, at the Michigan-Dartmouth-MIT (MDM) Observatory Observatory
on Kitt Peak, Arizona.
All our spectra are from the 2.4m Hiltner reflector with the Ohio
State Multi-object Spectrometer (OSMOS) used in single-slit mode. We
used the "blue" disperser, with the 1.1" "inner" slit, yielding
∼3.1Å resolution (FWHM) from 3980 to 6860Å, and a dispersion of
0.7Å per 15µm pixel.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 73 5 List of Objects
table2.dat 53 189 Radial Velocities
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See also:
III/211 : Keck/HIRES Sky Line Atlas (Osterbrock+ 1997)
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/other/IBVS/4431 : Margoni-Stagni variables (Skiff, 1997)
J/MNRAS/384/1277 : Hα emission line sources from IPHAS (Witham+, 2008)
J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)
J/ApJS/194/28 : The evolution of cataclysmic variables (Knigge+, 2011)
J/AJ/142/181 : CVs from SDSS. VIII. The final year (Szkody+, 2011)
J/MNRAS/443/3174 : 72 faint CV candidates in CRTS (Breedt+, 2014)
J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/AJ/159/43 : Spectro. identified CVs from LAMOST survey. I. (Hou+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- Name Object identifier
28- 29 I2 h RAh [2/20] Hour of right ascension (J2000)
31- 32 I2 min RAm Minute of right ascension (J2000)
34- 39 F6.3 s RAs Second of right ascension (J2000)
41 A1 --- DE- [+] Sign of declination (J2000)
42- 43 I2 deg DEd [19/41] Degree of declination (J2000)
45- 46 I2 arcmin DEm Arcminute of declination (J2000)
48- 52 F5.2 arcsec DEs Arcsecond of declination (J2000)
54- 57 F4.1 mag Gmag [15.2/17.4] Gaia DR2 mean magnitude
59- 61 I3 pc Dist [525/992] Gaia DR2 distance (1)
63- 64 I2 pc e_Dist [27/94] Error on Dist (1)
66- 69 F4.2 --- E(g-r) [0.01/0.35] Reddening in G
71- 73 F3.1 mag GMAG [4.3/8.3] Absolute magnitude in G
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Note (1): The distances and their error bars are the inverse of the DR2 parallax
πDR2, and do not include any corrections for possible systematic
errors.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- Name Name of object
28- 37 F10.4 d BJD [58829/58869] Barycentric Julian Date of
mid-integration, BJD-2400000
39- 42 I4 km/s RVela [-267/285]? Radial velocity of absorption lines
44- 45 I2 km/s e_RVela [7/70]? Error in absorption velocity
47- 50 I4 km/s RVele [-292/326]? Radial velocity of H-alpha emission
line
52- 53 I2 km/s e_RVele [2/35]? Error in emission velocity
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 16-Nov-2020