49 Cassiopeiae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia |
| 49 Cas A | |
| Right ascension | 02h 05m 31.55013s[1] |
| Declination | 76° 06′ 54.2164″[1] |
| Apparent magnitude (V) | 5.32[2] |
| 49 Cas B | |
| Right ascension | 02h 05m 30.09074s[3] |
| Declination | 76° 06′ 51.9730″[3] |
| Apparent magnitude (V) | 12.30[2] |
| Characteristics | |
| 49 Cas A | |
| Evolutionary stage | horizontal branch[4] |
| Spectral type | G8III[5] |
| B−V color index | 0.954±0.003[6] |
| Astrometry | |
| 49 Cas A | |
| Radial velocity (Rv) | −0.20±0.30[6] km/s |
| Proper motion (μ) | RA: −11.813[1] mas/yr Dec.: −20.561[1] mas/yr |
| Parallax (π) | 7.6673 ± 0.0700 mas[1] |
| Distance | 425 ± 4 ly (130 ± 1 pc) |
| Absolute magnitude (MV) | −0.44[7] |
| 49 Cas B | |
| Proper motion (μ) | RA: −13.572[3] mas/yr Dec.: −19.339[3] mas/yr |
| Parallax (π) | 7.9161 ± 0.0228 mas[3] |
| Distance | 412 ± 1 ly (126.3 ± 0.4 pc) |
| Details | |
| 49 Cas A | |
| Mass | 2.6[8] M☉ |
| Radius | 16.6[1] R☉ |
| Luminosity | 140[1] L☉ |
| Surface gravity (log g) | 2.66[8] cgs |
| Temperature | 5,087[9] K |
| Metallicity [Fe/H] | −0.04[9] dex |
| Rotational velocity (v sin i) | 1.2[10] km/s |
| Age | 647[9] Myr |
| 49 Cas B | |
| Mass | 0.81[3] M☉ |
| Radius | 0.76[3] R☉ |
| Luminosity | 0.28[3] L☉ |
| Surface gravity (log g) | 4.59[3] cgs |
| Temperature | 4,886[3] K |
| Age | 1.6[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
49 Cassiopeiae is a binary star[12] system in the northern circumpolar constellation of Cassiopeia. It is visible to the naked eye as a faint, yellow-hued point of light with an apparent visual magnitude of 5.22.[6] The system is located about 412 light years away from the Sun, based on parallax. The pair had an angular separation of 5.40″ along a position angle of 244°, as of 2008, with the brighter component being of magnitude 5.32 and its faint companion having magnitude 12.30.[2]
The primary, designated component A,[2] is an aging giant star with a stellar classification of G8III.[5] It is 302 million years old with 3.3 times the mass of the Sun.[7] With the supply of hydrogen at its core exhausted, the star has now expanded to 17 times the Sun's radius. It is a red clump giant on the horizontal branch, which indicates it is generating energy through the fusion of helium at its core.[4] The star is radiating 140 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 5,087 K. Its faint secondary companion, component B, is of an unknown spectral type. It has a temperature similar to the primary, but a luminosity much lower than the Sun's.
References
[edit]- ^ a b c d e f g 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 c d Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
- ^ a b c d e f g h i j k 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 Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv:astro-ph/0003329, Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID 16673121.
- ^ a b Abt, Helmut A. (2008), "Visual Multiples. IX. MK Spectral Types", The Astrophysical Journal Supplement Series, 176 (1): 216–217, Bibcode:2008ApJS..176..216A, doi:10.1086/525529.
- ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781, S2CID 16258166.
- ^ a b Queiroz, A. B. A.; Anders, F.; Chiappini, C.; Khalatyan, A.; Santiago, B. X.; Steinmetz, M.; Valentini, M.; Miglio, A.; Bossini, D.; Barbuy, B.; Minchev, I.; Minniti, D.; García Hernández, D. A.; Schultheis, M.; Beaton, R. L.; Beers, T. C.; Bizyaev, D.; Brownstein, J. R.; Cunha, K.; Fernández-Trincado, J. G.; Frinchaboy, P. M.; Lane, R. R.; Majewski, S. R.; Nataf, D.; Nitschelm, C.; Pan, K.; Roman-Lopes, A.; Sobeck, J. S.; Stringfellow, G.; Zamora, O. (2020), "From the bulge to the outer disc: StarHorse stellar parameters, distances, and extinctions for stars in APOGEE DR16 and other spectroscopic surveys", Astronomy and Astrophysics, 638: A76, arXiv:1912.09778, Bibcode:2020A&A...638A..76Q, doi:10.1051/0004-6361/201937364, S2CID 209439697.
- ^ a b c Ting, Yuan-Sen; Rix, Hans-Walter (2019), "The Vertical Motion History of Disk Stars throughout the Galaxy", The Astrophysical Journal, 878 (1): 21, arXiv:1808.03278, Bibcode:2019ApJ...878...21T, doi:10.3847/1538-4357/ab1ea5, S2CID 119211560.
- ^ Glebocki, R.; Gnacinski, P. (2005), "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki 2005)", VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G, 3244, Bibcode:2005yCat.3244....0G.
- ^ "49 Cas". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-22.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
