Psi7 Aurigae
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 06h 50m 45.943s[2] |
| Declination | +41° 46′ 52.43″[2] |
| Apparent magnitude (V) | 5.02[3] |
| Characteristics | |
| Spectral type | K3 III[4] |
| U−B color index | +1.35[3] |
| B−V color index | +1.27[3] |
| R−I color index | 0.46[citation needed] |
| Astrometry | |
| Radial velocity (Rv) | +59.53±0.25[5] km/s |
| Proper motion (μ) | RA: −25.542 mas/yr[2] Dec.: −137.253 mas/yr[2] |
| Parallax (π) | 9.6073±0.1274 mas[2] |
| Distance | 339 ± 5 ly (104 ± 1 pc) |
| Absolute magnitude (MV) | −0.33[1] |
| Details | |
| Mass | 1.72+1.26 −0.74[6] M☉ |
| Radius | 19.680[7] R☉ |
| Luminosity | 162+12 −11[6] L☉ |
| Surface gravity (log g) | 2.35[8] cgs |
| Temperature | 4,340±90[6] K |
| Metallicity [Fe/H] | 0.00[8] dex |
| Rotational velocity (v sin i) | 10[9] km/s |
| Age | 700±200[6] Myr |
| Other designations | |
| ψ7 Aur, 58 Aurigae, BD+41 1536, FK5 2527, GC 8931, HD 49520, HIP 32844, HR 2516, SAO 41380, PPM 49381, WDS J06508+4147A[10] | |
| Database references | |
| SIMBAD | data |
Psi7 Aurigae, is a star in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ψ7 Aurigae, and abbreviated Psi7 Aur or ψ7 Aur. This is a dim, naked eye star with an apparent visual magnitude of 5.02. Based upon parallax measurements, it is approximately 339 light-years (104 parsecs) distant from Earth. It is receding from the Sun with a radial velocity of +60 km/s.[5] Psi7 Aur is a probable member of the Hercules stream of co-moving stars.[11]
ψ7 Aur is an evolved giant star with a stellar classification of K3 III.[4] With 1.7[6] times the mass of the Sun, at an age of about 700 million[11] it has expanded to almost 20 times the Sun's radius.[7] The outer envelope has an effective temperature of 4,340,[6] giving it an orange colour and a classification as a K-type star.[12] Although cooler than the sun, its larger size means that it is more luminous, emitting in total 162 times as much electromagnetic radiation.[6]
It was also known to be part of a much bigger constellation named Telescopium Herschelii before it was unrecognized by the International Astronomical Union (IAU).[citation needed]
References
[edit]- ^ a b 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. XHIP record for this object at VizieR.
- ^ a b c d 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 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ a b Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode:1952ApJ...116..122R, doi:10.1086/145598.
- ^ a b Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
- ^ a b c d e f g Charbonnel, C.; et al. (January 2020), "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era", Astronomy and Astrophysics, 633: A34, arXiv:1910.12732, Bibcode:2020A&A...633A..34C, doi:10.1051/0004-6361/201936360, ISSN 0004-6361.
- ^ a b Stassun, Keivan G.; et al. (2019), "The Revised TESS Input Catalog and Candidate Target List", The Astronomical Journal, 158 (4): 138, arXiv:1905.10694, Bibcode:2019AJ....158..138S, doi:10.3847/1538-3881/ab3467.
- ^ a b McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527.
- ^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B.
- ^ "* 58 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-24.
- ^ a b Ramya, P.; et al. (August 2016), "Chemical compositions and kinematics of the Hercules stream", Monthly Notices of the Royal Astronomical Society, 460 (2): 1356−1370, arXiv:1604.04821, Bibcode:2016MNRAS.460.1356R, doi:10.1093/mnras/stw852.
- ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16.
