AR Cephei
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 51m 33.86137s[1] |
| Declination | +85° 02′ 46.9418″[1] |
| Apparent magnitude (V) | 6.9 - 8.3[2] |
| Characteristics | |
| Spectral type | M4 III[3] |
| B−V color index | +1.52[4] |
| Variable type | SRb[2] |
| Astrometry | |
| Radial velocity (Rv) | −15.66±0.23[1] km/s |
| Proper motion (μ) | RA: 26.580[1] mas/yr Dec.: 4.143[1] mas/yr |
| Parallax (π) | 3.2317±0.0967 mas[1] |
| Distance | 1,010 ± 30 ly (309 ± 9 pc) |
| Details | |
| Mass | 2.8[5] M☉ |
| Radius | 123[1] R☉ |
| Luminosity | 2,094[1] L☉ |
| Surface gravity (log g) | 1.49[5] cgs |
| Temperature | 2,400 - 3,700[citation needed] K |
| Metallicity [Fe/H] | −0.39[5] dex |
| Other designations | |
| BD+84 516, HD 217158, HIP 112882, SAO 3809[6] | |
| Database references | |
| SIMBAD | data |
AR Cephei (AR Cep) is a variable star in the constellation Cepheus. It is classified as a semiregular star[7][8] with a spectral type of M4III.[3]
Aernout de Sitter discovered the star in 1933.[3][9] It was given its variable star designation, AR Cephei, in 1939.[9]
AR Cephei is located approximately 1,010 light-years (309 parsecs) from the Solar System, and has a radial velocity of -16 km/s, meaning that it is moving toward the Sun at ~16 kilometers every second.[1]
See also
[edit]References
[edit]- ^ a b c d e f g h i Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
- ^ a b c Kucinskas, Arunas (1990). "Változócsillagok. A AR Cephei statisztikai analízise" (PDF). Meteor (in Hungarian). 20: 31–33.
- ^ Oja, T. (1984). "UBV photometry of stars whose positions are accurately known". Astronomy and Astrophysics Supplement Series. 57: 357. Bibcode:1984A&AS...57..357O.
- ^ a b c Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
- ^ "V* AR Cep". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-03-19.
- ^ Kučinskas, Arūnas (1990). "Statistical Analysis of the Semiregular Variable AR Cephei". The Journal of the American Association of Variable Star Observers. 19 (1): 73–75. Bibcode:1990JAVSO..19...73K.
- ^ "obj-Cep". britastro.org. Retrieved 2024-09-25.
- ^ a b Guthnick, P.; Schneller, H. (1939). "Benennung von veränderlichen Sternen". Astronomische Nachrichten. 268 (11–12): 165. Bibcode:1939AN....268..165G. doi:10.1002/asna.19392681102.
- ^ "ASAS-SN Variable Stars Database". ASAS-SN Variable Stars Database. ASAS-SN. Retrieved 20 October 2024.
