Astronomy:9 Cassiopeiae
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Short description: Star in the constellation Cassiopeia
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00h 04m 13.6625s[1] |
| Declination | +62° 17′ 15.591″[1] |
| Apparent magnitude (V) | +5.884[2] |
| Characteristics | |
| Spectral type | A1II-III[3] |
| U−B color index | +0.29[4] |
| B−V color index | +0.30[4] |
| Astrometry | |
| Radial velocity (Rv) | −23.43±0.16[1] km/s |
| Proper motion (μ) | RA: −0.936[1] mas/yr Dec.: −0.263[1] mas/yr |
| Parallax (π) | 1.3781 ± 0.0237[1] mas |
| Distance | 2,370 ± 40 ly (730 ± 10 pc) |
| Details | |
| Mass | 5.1[5] M☉ |
| Radius | 26[6] R☉ |
| Luminosity | 2,208[6] L☉ |
| Surface gravity (log g) | 2.08[5] cgs |
| Temperature | 7,719[6] K |
| Metallicity [Fe/H] | −0.32[5] dex |
| Rotational velocity (v sin i) | 33[7] km/s |
| Age | 25.1[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
9 Cassiopeiae (9 Cas) is a white giant star in the constellation Cassiopeia, about 2,370 light years away.
9 Cassiopeiae is classified as an A1 type giant or bright giant. One study noted peculiarities in the spectrum that could indicate a λ Boötis star,[9] but other researchers have refuted this.[10][7]
At an age of 25 million years, 9 Cassiopeiae has expanded away from the main sequence after exhausting its core hydrogen and now has a radius about 26 times that of the Sun. With an effective temperature of about 7,700 K, it emits more than two thousand times the luminosity of the Sun.
9 Cassiopeiae has a number of faint companions listed in multiple star catalogues,[11] but they all appear to be at different distances[12] and none are thought to be gravitationally associated.[13]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27. doi:10.1888/0333750888/2862. Bibcode: 2000A&A...355L..27H.
- ↑ Gray, R. O.; Garrison, R. F. (December 1987). "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation". Astrophysical Journal Supplement 65: 581. doi:10.1086/191237. Bibcode: 1987ApJS...65..581G.
- ↑ 4.0 4.1 The Bright Star Catalogue. New Haven: Yale University Observatory. 1991. Bibcode: 1991bsc..book.....H.
- ↑ 5.0 5.1 5.2 Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A. et al. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. Bibcode: 2019A&A...628A..94A.
- ↑ 6.0 6.1 6.2 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 7.0 7.1 Murphy, Simon J.; Corbally, Christopher J.; Gray, Richard O.; Cheng, Kwang-Ping; Neff, James E.; Koen, Chris; Kuehn, Charles A.; Newsome, Ian et al. (2015). "An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue". Publications of the Astronomical Society of Australia 32. doi:10.1017/pasa.2015.34. Bibcode: 2015PASA...32...36M.
- ↑ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (October 12, 2010). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society (Oxford University Press (OUP)) 410 (1): 190–200. doi:10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711. Bibcode: 2011MNRAS.410..190T.
- ↑ Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series 99: 135. doi:10.1086/192182. ISSN 0067-0049. Bibcode: 1995ApJS...99..135A.
- ↑ Hauck, B.; Ballereau, D.; Chauville, J. (1998). "New lambda Bootis stars with a shell". Astronomy and Astrophysics Supplement Series 128 (3): 429. doi:10.1051/aas:1998154. Bibcode: 1998A&AS..128..429H.
- ↑ Mason, Brian D. et al. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M.
- ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940
- ↑ Eggleton, P. P.; Tokovinin, A. A. (3 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
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