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1 Pegasi
Location of 1 Pegasi (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Pegasus
Right ascension 21h 22m 05.199s [1]
Declination 19° 48′ 16.24″ [1]
Apparent magnitude (V) 4.09 [2]
Characteristics
Spectral type K1III [3]
U−B color index +1.05 [2]
B−V color index +1.11 [2]
Astrometry
Radial velocity (Rv)−10.80 [4] km/s
Proper motion (μ) RA: +105.35 [1]  mas/ yr
Dec.: +63.51 [1]  mas/ yr
Parallax (π)20.93 ± 0.17  mas [1]
Distance156 ± 1  ly
(47.8 ± 0.4  pc)
Absolute magnitude (MV)0.68 [5]
Details
1 Peg A
Mass1.57 [6]  M☉
Radius12 [6]  R☉
Luminosity71.78 [5]  L☉
Surface gravity (log g)2.59 [7]  cgs
Temperature4,600 [8]  K
Metallicity [Fe/H]+0.01 [7]  dex
Rotational velocity (v sin i)1.2 [9] km/s
Other designations
1 Peg, BD+19°4691, FK5 804, GC 29914, HD 203504, HIP 105502, HR 8173, SAO 107073, CCDM J21221+1949A, WDS J21221+1948A [10]
Database references
SIMBAD data

1 Pegasi (1 Peg) is a triple star [11] system in the constellation Pegasus, located approximately 156  light years away from the Sun based on parallax. [1] It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.09. [2] The system is moving closer to the Earth with a heliocentric radial velocity of −11 km/s. [4]

The primary component is a giant with a stellar classification of K1III, [3] a star that has exhausted the hydrogen supply at its core and evolved away from the main sequence. It has 1.57 [6] times the mass of the Sun and has expanded to 12 [6] times the Sun's radius. The star is radiating 72 [5] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,600 K. [8]

There are several companions in addition to the primary. The brightest, component B, is a magnitude 9.3, K-type main-sequence star with a class of K0 V orbiting at an angular separation of 36.6" from the primary; it is itself a single-lined spectroscopic binary with an orbital period of 3.042 ± 0.011 years and eccentricity of 0.290±0.022. [12] Visual companions C, with magnitude 12.9 and separation 64.7", and D, with magnitude 9.6 and separation 5.3", have been reported. [13]

References

  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752. Bibcode: 2007A&A...474..653V. doi: 10.1051/0004-6361:20078357. S2CID  18759600. Vizier catalog entry
  2. ^ a b c d 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 Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode: 1995yCat.5050....0H.
  4. ^ a b Bakos, G. A. (1974). "Radial velocity measurements of visual binaries. 1". The Astronomical Journal. 79: 866. Bibcode: 1974AJ.....79..866B. doi: 10.1086/111622.
  5. ^ a b c 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. S2CID  119257644. Vizier catalog entry
  6. ^ a b c d Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002. Bibcode: 1999A&A...352..555A. Vizier catalog entry
  7. ^ a b Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv: 1009.1491. Bibcode: 2011A&A...525A..71W. doi: 10.1051/0004-6361/201015014. S2CID  53480665.
  8. ^ a b Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters. 34 (11): 785–796. arXiv: 1607.00619. Bibcode: 2008AstL...34..785G. doi: 10.1134/S1063773708110078. S2CID  73524157. Vizier catalog entry
  9. ^ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433. arXiv: astro-ph/0608248. Bibcode: 1999A&AS..139..433D. doi: 10.1051/aas:1999401. Vizier catalog entry
  10. ^ "1 Peg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-10.
  11. ^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. S2CID  14878976. Vizier catalog entry
  12. ^ Griffin, R. F. (February 1987). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 72: 1 Pegasi B". The Observatory. 107: 1–5. Bibcode: 1987Obs...107....1G.
  13. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode: 2001AJ....122.3466M. doi: 10.1086/323920. Vizier catalog entry
Retrieved from " https://en.wikipedia.org/?title=1_Pegasi&oldid=1170126357"
From Wikipedia, the free encyclopedia
1 Pegasi
Location of 1 Pegasi (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Pegasus
Right ascension 21h 22m 05.199s [1]
Declination 19° 48′ 16.24″ [1]
Apparent magnitude (V) 4.09 [2]
Characteristics
Spectral type K1III [3]
U−B color index +1.05 [2]
B−V color index +1.11 [2]
Astrometry
Radial velocity (Rv)−10.80 [4] km/s
Proper motion (μ) RA: +105.35 [1]  mas/ yr
Dec.: +63.51 [1]  mas/ yr
Parallax (π)20.93 ± 0.17  mas [1]
Distance156 ± 1  ly
(47.8 ± 0.4  pc)
Absolute magnitude (MV)0.68 [5]
Details
1 Peg A
Mass1.57 [6]  M☉
Radius12 [6]  R☉
Luminosity71.78 [5]  L☉
Surface gravity (log g)2.59 [7]  cgs
Temperature4,600 [8]  K
Metallicity [Fe/H]+0.01 [7]  dex
Rotational velocity (v sin i)1.2 [9] km/s
Other designations
1 Peg, BD+19°4691, FK5 804, GC 29914, HD 203504, HIP 105502, HR 8173, SAO 107073, CCDM J21221+1949A, WDS J21221+1948A [10]
Database references
SIMBAD data

1 Pegasi (1 Peg) is a triple star [11] system in the constellation Pegasus, located approximately 156  light years away from the Sun based on parallax. [1] It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.09. [2] The system is moving closer to the Earth with a heliocentric radial velocity of −11 km/s. [4]

The primary component is a giant with a stellar classification of K1III, [3] a star that has exhausted the hydrogen supply at its core and evolved away from the main sequence. It has 1.57 [6] times the mass of the Sun and has expanded to 12 [6] times the Sun's radius. The star is radiating 72 [5] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,600 K. [8]

There are several companions in addition to the primary. The brightest, component B, is a magnitude 9.3, K-type main-sequence star with a class of K0 V orbiting at an angular separation of 36.6" from the primary; it is itself a single-lined spectroscopic binary with an orbital period of 3.042 ± 0.011 years and eccentricity of 0.290±0.022. [12] Visual companions C, with magnitude 12.9 and separation 64.7", and D, with magnitude 9.6 and separation 5.3", have been reported. [13]

References

  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752. Bibcode: 2007A&A...474..653V. doi: 10.1051/0004-6361:20078357. S2CID  18759600. Vizier catalog entry
  2. ^ a b c d 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 Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode: 1995yCat.5050....0H.
  4. ^ a b Bakos, G. A. (1974). "Radial velocity measurements of visual binaries. 1". The Astronomical Journal. 79: 866. Bibcode: 1974AJ.....79..866B. doi: 10.1086/111622.
  5. ^ a b c 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. S2CID  119257644. Vizier catalog entry
  6. ^ a b c d Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002. Bibcode: 1999A&A...352..555A. Vizier catalog entry
  7. ^ a b Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv: 1009.1491. Bibcode: 2011A&A...525A..71W. doi: 10.1051/0004-6361/201015014. S2CID  53480665.
  8. ^ a b Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters. 34 (11): 785–796. arXiv: 1607.00619. Bibcode: 2008AstL...34..785G. doi: 10.1134/S1063773708110078. S2CID  73524157. Vizier catalog entry
  9. ^ De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433. arXiv: astro-ph/0608248. Bibcode: 1999A&AS..139..433D. doi: 10.1051/aas:1999401. Vizier catalog entry
  10. ^ "1 Peg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-10.
  11. ^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv: 0806.2878. Bibcode: 2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x. S2CID  14878976. Vizier catalog entry
  12. ^ Griffin, R. F. (February 1987). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 72: 1 Pegasi B". The Observatory. 107: 1–5. Bibcode: 1987Obs...107....1G.
  13. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode: 2001AJ....122.3466M. doi: 10.1086/323920. Vizier catalog entry
Retrieved from " https://en.wikipedia.org/?title=1_Pegasi&oldid=1170126357"

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