Astronomy:5 Serpentis

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Short description: Star in the constellation Serpens
5 Serpentis
Location of 5 Serpentis (circled)
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Serpens[1]
A
Right ascension  15h 19m 18.79744s[2]
Declination +01° 45′ 55.4664″[2]
Apparent magnitude (V) 5.10[3]
B
Right ascension  15h 19m 19.24262s[4]
Declination +01° 46′ 04.8433″[4]
Apparent magnitude (V) 10.09[5]
Characteristics
A
Evolutionary stage subgiant[2]
Spectral type F8 IV[6][7]
B−V color index 0.50[3]
B
Evolutionary stage main sequence[8]
Spectral type dK6.2[8]
Astrometry
A
Radial velocity (Rv)+54.37±0.13[2] km/s
Proper motion (μ) RA: +372.216[2] mas/yr
Dec.: −513.483[2] mas/yr
Parallax (π)39.7954 ± 0.0807[2] mas
Distance82.0 ± 0.2 ly
(25.13 ± 0.05 pc)
Absolute magnitude (MV)+3.02[9]
B
Radial velocity (Rv)+55.29±0.26[4] km/s
Proper motion (μ) RA: +371.601[4] mas/yr
Dec.: −507.580[4] mas/yr
Parallax (π)39.7714 ± 0.0187[4] mas
Distance82.01 ± 0.04 ly
(25.14 ± 0.01 pc)
Absolute magnitude (MV)+8.10[8]
Details
A
Mass1.2[3] M☉
Radius2.3[10] R☉
Luminosity5.0[3] L☉
Surface gravity (log g)4.07[7] cgs
Temperature6,134±39[3] K
Metallicity [Fe/H]+0.02[11] dex
Rotation14 days[12]
Rotational velocity (v sin i)4.8[7] km/s
Age4.5[3] Gyr
B
Mass0.638[13] M☉
Radius0.563[8] R☉
Luminosity0.111[13] L☉
Surface gravity (log g)4.55[10] cgs
Temperature4,241[8] K
Other designations
5 Ser, BD+02°2944, HR 5694, WDS J15193+0146AB[14]
A: MQ Ser, HD 136202, HIP 74975, SAO 120946
B:
Database references
SIMBADdata
B
5 Serpentis, near the globular cluster Messier 5

5 Serpentis is a wide binary star[15] system in Serpens Caput, the western section of the equatorial constellation of Serpens. It is faintly visible to the naked eye with an apparent visual magnitude of 5.10. Based upon an annual parallax shift of 39.8 mas as viewed from Earth's orbit, it is located 82 light years away. The brighter member is an IAU radial velocity standard star,[16] and it is moving away from the Sun with a heliocentric radial velocity of +54.3 km/s. The system made its closest approach to the Sun about 153,000 years ago at a separation of 68 ly (20.7 pc).[9]

The primary, component A, is an F-type subgiant star with a stellar classification of F8 IV,[6][7] a star that has exhausted its core hydrogen and is evolving to become a red giant. The star was once thought to be a BY Draconis variable with the variable star designation MQ Ser,[17] but has been found not to be.[18] From observations made between 1975 and 1980, Bakos (1983) reported random, small brightness variations with an amplitude of less than 0.03 magnitude, plus three flare events that increased the brightness by 0.1 magnitudes.[19] However, Scarfe (1985) noted that these observations may instead be due to normal observational error.[16]

The common proper motion companion, component B, is a magnitude 10.1 star at an angular separation of 11.4″ along a position angle of 35°. It has an estimated orbital period of 3,371 years.[15] According to Hoffleit (1991), if this is a variable star it may account for the observations of Bakos (1983).[20]

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Luck, R. Earle (2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal 153 (1): 21. doi:10.3847/1538-3881/153/1/21. Bibcode: 2017AJ....153...21L. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 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.
  5. ↑ Reiners, Ansgar; Zechmeister, Mathias (2020). "Radial Velocity Photon Limits for the Dwarf Stars of Spectral Classes F-M". The Astrophysical Journal Supplement Series 247 (1): 11. doi:10.3847/1538-4365/ab609f. Bibcode: 2020ApJS..247...11R. 
  6. ↑ 6.0 6.1 Gray, R. O. et al. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". The Astronomical Journal 121 (4): 2148–2158. doi:10.1086/319956. Bibcode: 2001AJ....121.2148G. 
  7. ↑ 7.0 7.1 7.2 7.3 Mallik, Sushma V. et al. (October 2003). "Lithium and rotation in F and G dwarfs and subgiants". Astronomy and Astrophysics 409: 251–261. doi:10.1051/0004-6361:20031084. Bibcode: 2003A&A...409..251M. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 Houdebine, Éric R.; Mullan, D. J.; Doyle, J. G.; de la Vieuville, Geoffroy; Butler, C. J.; Paletou, F. (2019). "The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs". The Astronomical Journal 158 (2): 56. doi:10.3847/1538-3881/ab23fe. Bibcode: 2019AJ....158...56H. 
  9. ↑ 9.0 9.1 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.
  10. ↑ 10.0 10.1 Stassun, Keivan G. et al. (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. 
  11. ↑ Maldonado, J. et al. (May 2012). "Metallicity of solar-type stars with debris discs and planets⋆". Astronomy & Astrophysics 541: 10. doi:10.1051/0004-6361/201218800. A40. Bibcode: 2012A&A...541A..40M. 
  12. ↑ Baliunas, Sallie; Sokoloff, Dmitry; Soon, Willie (1996). "Magnetic Field and Rotation in Lower Main-Sequence Stars: An Empirical Time-dependent Magnetic Bode's Relation?". The Astrophysical Journal 457 (2): L99–L102. doi:10.1086/309891. Bibcode: 1996ApJ...457L..99B. 
  13. ↑ 13.0 13.1 Hardegree-Ullman, Kevin K.; Apai, Dániel; Bergsten, Galen J.; Pascucci, Ilaria; López-Morales, Mercedes (2023). "Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O2 Levels in Nearby Transiting Habitable-zone Exoplanets". The Astronomical Journal 165 (6): 267. doi:10.3847/1538-3881/acd1ec. Bibcode: 2023AJ....165..267H. 
  14. ↑ "5 Ser". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=5+Ser. 
  15. ↑ 15.0 15.1 Tokovinin, Andrei (April 2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal 147 (4): 14. doi:10.1088/0004-6256/147/4/87. 87. Bibcode: 2014AJ....147...87T. 
  16. ↑ 16.0 16.1 Scarfe, C. D. (August 1985). "On the Velocity Variability of 5-SERPENTIS and Omicron-Aquilae". Journal of the Royal Astronomical Society of Canada 79 (595): 180. Bibcode: 1985JRASC..79..180S. 
  17. ↑ Kholopov, P. N. et al. (1985). "The 67th Name-List of Variable Stars". Information Bulletin on Variable Stars 2681: 1. Bibcode: 1985IBVS.2681....1K. 
  18. ↑ "MQ Serpentis". AAVSO Website. American Association of Variable Star Observers. 13 November 2011. http://www.aavso.org/vsx/index.php?view=detail.top&oid=34870. 
  19. ↑ Bakos, G. A. (May 1983). "Flare activity in two F-type stars, 5 Ser and ο Aql". Astronomical Journal 88: 674–677. doi:10.1086/113357. Bibcode: 1983AJ.....88..674B. 
  20. ↑ Hoffleit, Dorrit (October 1991). "MQ Serpentis, A Mystery". The Journal of the American Association of Variable Star Observers 20 (2): 239–240. Bibcode: 1991JAVSO..20..239H. 



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