Astronomy:HD 193373
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 19m 29.2960s[1] |
| Declination | +13° 13′ 00.3571″[1] |
| Apparent magnitude (V) | 6.21[2] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M1 III[4] |
| B−V color index | +1.63[2] |
| Astrometry | |
| Radial velocity (Rv) | 22.68±0.13[5] km/s |
| Proper motion (μ) | RA: −15.865[1] mas/yr Dec.: −18.581[1] mas/yr |
| Parallax (π) | 3.8556 ± 0.0442[1] mas |
| Distance | 846 ± 10 ly (259 ± 3 pc) |
| Absolute magnitude (MV) | −0.46[6] |
| Details | |
| Mass | 1.77[7] M☉ |
| Radius | 57.5[8] R☉ |
| Luminosity | 592±16[9] L☉ |
| Surface gravity (log g) | 0.89[10] cgs |
| Temperature | 3,884±122[8] K |
| Metallicity [Fe/H] | +0.08[10] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 193373 (HR 7771) is a solitary red hued star located in the equatorial constellation Delphinus. It has an apparent magnitude of 6.21,[2] placing it near the limit for naked eye visibility. Parallax measurements place it 846 light years distant[1] and it is currently receding with a heliocentric radial velocity of 22.7 km/s.[5]
This is an asymptotic giant branch star[3] with a stellar classification of M1 III.[4] In its current state, the object is fusing hydrogen and helium shells around an inert carbon core. HR 7771 has 177% the mass of the Sun[7] but has expanded to an enlarged radius of 57.5 R☉.[8] It radiates at 592 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 3,884 K,[8] giving a red hue. HD 193373 has an iron abundance 120% that of the Sun, making it slightly metal enriched.[10]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D.
- ↑ 3.0 3.1 Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal 104: 275. doi:10.1086/116239. ISSN 0004-6256. Bibcode: 1992AJ....104..275E.
- ↑ 4.0 4.1 Wilson, Ralph E.; Joy, Alfred H. (March 1950). "Radial Velocities of 2111 Stars.". The Astrophysical Journal 111: 221. doi:10.1086/145261. ISSN 0004-637X. Bibcode: 1950ApJ...111..221W.
- ↑ 5.0 5.1 Famaey, B.; Pourbaix, D.; Frankowski, A.; Van Eck, S.; Mayor, M.; Udry, S.; Jorissen, A. (18 February 2009). "Spectroscopic binaries among Hipparcos M giants". Astronomy & Astrophysics 498 (2): 627–640. doi:10.1051/0004-6361/200810698. ISSN 0004-6361. Bibcode: 2009A&A...498..627F.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K.
- ↑ 8.0 8.1 8.2 8.3 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S.
- ↑ 9.0 9.1 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.
- ↑ 10.0 10.1 10.2 Anders, F. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A.
- ↑ "HR 7771". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+7771.
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