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HD 193373
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
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  mas/ yr [1]
Dec.: −18.581  mas/ yr [1]
Parallax (π)3.8556 ± 0.0442  mas [1]
Distance846 ± 10  ly
(259 ± 3  pc)
Absolute magnitude (MV)−0.46 [6]
Details
Mass1.77 [7]  M☉
Radius57.5 [8]  R☉
Luminosity592±16 [9]  L☉
Surface gravity (log g)0.89 [10]  cgs
Temperature3,884±122 [8]  K
Metallicity [Fe/H]+0.08 [10]  dex
Other designations
AG+13°2092, BD+12°4289, HD 193373, HIP 100208, HR 7771, SAO 105961 [11]
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. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv: 2012.01533. Bibcode: 2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657. S2CID  227254300. (Erratum:  doi: 10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b c 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. ^ a b Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode: 1992AJ....104..275E. doi: 10.1086/116239. ISSN  0004-6256.
  4. ^ a b Wilson, Ralph E.; Joy, Alfred H. (March 1950). "Radial Velocities of 2111 Stars". The Astrophysical Journal. 111: 221. Bibcode: 1950ApJ...111..221W. doi: 10.1086/145261. eISSN  1538-4357. ISSN  0004-637X.
  5. ^ a b 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. arXiv: 0901.0934. Bibcode: 2009A&A...498..627F. doi: 10.1051/0004-6361/200810698. eISSN  1432-0746. ISSN  0004-6361.
  6. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. eISSN  1562-6873. ISSN  1063-7737. S2CID  119257644.
  7. ^ a b Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912. Bibcode: 2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146. eISSN  1432-0746. ISSN  0004-6361.
  8. ^ a b c d Stassun, Keivan G.; et al. (9 September 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. ISSN  0004-6256.
  9. ^ a b Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  10. ^ a b c 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. arXiv: 1904.11302. Bibcode: 2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765. ISSN  0004-6361.
  11. ^ "HR 7771". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved July 26, 2022.
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