Follow-up Studies of Five Cataclysmic Variable Candidates Discovered by LAMOST

Abstract

We report follow-up observations of five cataclysmic variable candidates from LAMOST published by Hou et al. (2020). LAMOST J024048.51+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 7.34-hr period discovered in the Catalina survey data (Drake et al. 2014) is orbital. Another object, LAMOST J204305.95+341340.6 appears to be a near twin of the novalike variable V795 Her, with an orbital period in the so-called 2-3 hour "gap". LAMOST J035913.61+405035.0 is evidently an eclipsing, weakly-outbursting dwarf nova with a 5.48-hr period. Our spectrum of LAMOST J090150.09+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 4686 emission evident in the published discovery spectrum. We again confirm that a period from the Catalina data, in this case 6.80 hr, is orbital. LAMOST J033940.98+414805.7 yields a radial-velocity period of 3.54 hr, 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.

arXiv commentAstronomical Journal, in press

References in corpus (26)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• First Results from the Catalina Real-time Transient Survey
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• ATLAS: A High-Cadence All-Sky Survey System
• The Evolution of Cataclysmic Variables as Revealed by their Donor Stars
• The Catalina Surveys Periodic Variable Star Catalog
• The Donor Stars of Cataclysmic Variables
• Master Robotic Net
• A Volume Limited Sample of Cataclysmic Variables from $Gaia$ DR2: Space Density and Population Properties
• Population Synthesis of Cataclysmic Variables: I. Inclusion of Detailed Nuclear Evolution
• The IPHAS Catalogue of Halpha Emission Line Sources in the Northern Galactic Plane
• Cataclysmic Variables from SDSS. VIII. The Final Year (2007-2008)
• Evolution of Cataclysmic Variables and Related Binaries Containing a White-Dwarf
• Gaia data release 1: Principles of the photometric calibration of the G band
• One thousand cataclysmic variables from the Catalina Real-time Transient Survey
• A precise HST parallax of the cataclysmic variable EX Hydrae, its system parameters, and accretion rate
• Spectroscopic search for new SW Sextantis stars in the 3-4 hour orbital period range -- I
• Dwarf novae in the Hamburg Quasar Survey: Rarer than expected
• Roche tomography of cataclysmic variables -- III. Starspots on AE Aqr
• On the space density of X-ray selected cataclysmic variables
• When the disc's away, the stars will play: dynamical masses in the nova-like variable KR Aur with a pinch of accretion
• V405 Peg (RBS 1955): A Nearby, Low-Luminosity Cataclysmic Binary
• Analyzing the Low State of EF Eridani with Hubble Space Telescope Ultraviolet Spectra
• XMM-Newton observations of the low-luminosity cataclysmic variable V405 Pegasi

Cited by in corpus (11)

• Found: a rapidly spinning white dwarf in LAMOST J024048.51+195226.9
• The Orbital Period vs. Absolute Magnitude Relationship of Intermediate Polars: Implications for Low States and Outbursts
• Radio and optical observations of the possible AE Aqr twin, LAMOST J024048.51+195226.9
• Confirmation of a Second Propeller: A High-Inclination Twin of AE~Aquarii
• Unveiling the white dwarf in J191213.72-441045.1 through ultraviolet observations
• Radio detections of two unusual cataclysmic variables in the VLA Sky Survey
• Optical detection of the rapidly spinning white dwarf in V1460 Her
• VLA Observations of the AE Aqr-type Cataclysmic Variable LAMOST J024048.51+195226.9
• VLBI detection of the AE Aqr twin, LAMOST J024048.51+195226.9
• Exploration of faint X-ray and radio sources in the massive globular cluster M14: A UV-bright counterpart to Nova Ophiuchus 1938
• LAMOST J2043+3413 -- a Fast Disk Precession SW Sextans Candidate in Period Gap