2025MNRAS.537.3078A

Query : 2025MNRAS.537.3078A

2025MNRAS.537.3078A - Mon. Not. R. Astron. Soc., 537, 3078-3090 (2025/March-2)

Follow-up on three poorly studied AM CVn stars.

AUNGWEROJWIT A., GANSICKE B.T., BREEDT E., ARJYOTHA S., HERMES J.J., HAMBSCH F.-J., KUMAR A., RAMIREZ S.H., WILSON T.G., DHILLON V.S., MARSH T.R., POSHYACHINDA S., SCARINGI S., HAISLIP J.B. and REICHART D.E.

Abstract (from CDS):

We report follow-up observations of three poorly studied AM CVn-type binaries: CRTS CSS150211 J091017-200813, NSV 1440, and SDSS J183131.63+420220.2. Analysing time-series photometry obtained with a range of ground-based facilities as well as with the Transiting Exoplanet Survey Satellite (TESS), we determine the superhump period of CRTS J0910-2008 as $\rm{P_{sh}}=29.700\pm 0.004$ min and the orbital period of NSV 1440 as $\rm{P_{orb}}=36.56\pm 0.03$ min. We also confirm a photometric period of $P=23.026\pm 0.097$ min in SDSS J1831+4202, which is most likely the superhump period. We also report the first optical spectroscopy of CRTS J0910-2008 and NSV 1440 which unambiguously confirms both as AM CVn systems. We briefly discuss the distribution in the Hertzsprung-Russell diagram of the currently known sample of 63 AM CVn stars with known periods and Gaia data.

Abstract Copyright: © 2025 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): binaries: close - stars: dwarf novae - stars: individual: CRTS J091017.43-200812.3, NSV 1440, SDSS J183131.63+420220.2 - novae, cataclysmic variables

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SV* BV 1025 CV* 03 55 17.9464476439 -82 26 11.305091770         18.472 ~ 17 0
2 GALEX J080710.3+485300 CV* 08 07 10.3434499368 +48 52 59.643282252           DB 14 0
3 CRTS CSS150211 J091017-200813 CV* 09 10 17.4471138576 -20 08 12.461810316           ~ 8 0
4 SDSS J113732.34+405458.0 CV* 11 37 32.3210580864 +40 54 58.488391584           DQ: 25 0
5 ASASSN -21au CV* 14 23 52.8220 +78 30 13.373           ~ 10 0
6 Gaia DR3 2111270721441518208 * 18 31 21.7393280264 +42 02 29.036244153           ~ 1 0
7 SDSS J183131.64+420220.2 CV* 18 31 31.6370401944 +42 02 20.324249304           DB 18 0

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