HD 193373

Last updated
HD 193373
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Delphinus [1]
Right ascension 20h 19m 29.2960s [2]
Declination +13° 13′ 00.357″ [2]
Apparent magnitude  (V)6.21 [3]
Characteristics
Evolutionary stage AGB [4]
Spectral type M1 III [5]
B−V color index +1.63 [3]
Astrometry
Radial velocity (Rv)22.68±0.13 [6] km/s
Proper motion (μ)RA: −15.865 mas/yr [2]
Dec.: −18.581 mas/yr [2]
Parallax (π)3.8556±0.0442  mas [2]
Distance 846 ± 10  ly
(259 ± 3  pc)
Absolute magnitude  (MV)−0.46 [1]
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
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, [3] placing it near the limit for naked eye visibility. Parallax measurements place it 846 light years distant [2] and it is currently receding with a heliocentric radial velocity of 22.7  km/s . [6]

This is an asymptotic giant branch star [4] with a stellar classification of M1 III. [5] 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. 1 2 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.
  2. 1 2 3 4 5 6 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.
  3. 1 2 3 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.
  4. 1 2 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.
  5. 1 2 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.
  6. 1 2 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.
  7. 1 2 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. 1 2 3 4 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. 1 2 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. 1 2 3 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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