Astronomy:Psi7 Aurigae
  | |
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 06h 50m 45.943s[2] |
| Declination | +41° 46′ 52.43″[2] |
| Apparent magnitude (V) | 5.02[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| 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[2] mas/yr Dec.: −137.253[2] mas/yr |
| Parallax (π) | 9.6073 ± 0.1274[2] mas |
| 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 | |
| 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
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.0 3.1 3.2 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.
- ↑ 4.0 4.1 Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal 116: 122, doi:10.1086/145598, Bibcode: 1952ApJ...116..122R.
- ↑ 5.0 5.1 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, doi:10.1051/0004-6361:20041272, Bibcode: 2005A&A...430..165F.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 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, doi:10.1051/0004-6361/201936360, ISSN 0004-6361, Bibcode: 2020A&A...633A..34C.
- ↑ 7.0 7.1 Stassun, Keivan G. (2019), "The Revised TESS Input Catalog and Candidate Target List", The Astronomical Journal 158 (4): 138, doi:10.3847/1538-3881/ab3467, Bibcode: 2019AJ....158..138S.
- ↑ 8.0 8.1 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, doi:10.1086/191527, Bibcode: 1990ApJS...74.1075M.
- ↑ 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. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+58+Aur.
- ↑ 11.0 11.1 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, doi:10.1093/mnras/stw852, Bibcode: 2016MNRAS.460.1356R.
- ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16.
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