Follow-up on three poorly studied AM CVn stars
ABSTRACT 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.
Authors
- F.-J. Hambsch
- S H Ramírez (ORCID: https://orcid.org/0000-0001-5807-0800)
- J. J. Hermes (ORCID: https://orcid.org/0000-0001-5941-2286)
- Simone Scaringi (ORCID: https://orcid.org/0000-0001-5387-7189)
- S. Poshyachinda
- Amit Kumar (ORCID: https://orcid.org/0000-0002-4870-9436)
- S. Arjyotha
- V. S. Dhillon (ORCID: https://orcid.org/0000-0003-4236-9642)
- A. Aungwerojwit (ORCID: https://orcid.org/0000-0001-5686-5650)
- J. Haislip (ORCID: https://orcid.org/0000-0002-6703-805X)
- T. R. Marsh (ORCID: https://orcid.org/0000-0002-2498-7589)
- T. G. Wilson (ORCID: https://orcid.org/0000-0001-8749-1962)
- E. Breedt (ORCID: https://orcid.org/0000-0001-6180-3438)
- Boris T. Gänsicke (ORCID: https://orcid.org/0000-0002-2761-3005)
- D. E. Reichart
Institutions
- Boston University (US)
- University of North Carolina at Chapel Hill (US)
- Royal Holloway University of London (GB)
- Durham University (GB)
- American Association of Variable Star Observers (US)
- University of Cambridge (GB)
- Astronomical Observatory of Capodimonte (IT)
- University of Warwick (GB)
- Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne (DE)
- Institute of Astronomy (RU)
- Instituto de Astrofísica de Canarias (ES)
- Stichting tot Steun VCVGZ (NL)
- Naresuan University (TH)
- National Astronomical Research Institute of Thailand (TH)
- University of Sheffield (GB)
Publication Details
- Journal
- Monthly Notices of the Royal Astronomical Society
- Published
- 2025-01-28
- DOI
- https://doi.org/10.1093/mnras/staf173
- Citations
- 2
- Primary Topic
- Astrophysics and Star Formation Studies
- Type
- article
- Field-Weighted Citation Impact
- 2.31
Funders
- National Science Foundation
- National Aeronautics and Space Administration
- California Institute of Technology
- Michigan State University
- University of Washington
- National Astronomical Research Institute of Thailand
- European Commission
- Ministério da Ciência, Tecnologia e Inovação
- Stockholms Universitet
- College of Engineering, Michigan State University
- University of North Carolina at Chapel Hill
- Science Mission Directorate
- Deutsches Elektronen-Synchrotron