Rho Serpentis

Rho Serpentis, Latinized from ρ Serpentis, is a single[9] star in the Caput section of the equatorial Serpens constellation. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.78.[2] The distance to this star is approximately 375 light years based on parallax,[1] but it is drifting closer to the Sun with a radial velocity of −62 km/s.[4]

Rho Serpentis
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension  15h 51m 15.90985s[1]
Declination +20° 58′ 40.5166″[1]
Apparent magnitude (V) 4.78[2]
Characteristics
Spectral type K4.5III[3]
U−B color index +1.88[2]
B−V color index +1.54[2]
Astrometry
Radial velocity (Rv)−61.96[4] km/s
Proper motion (μ) RA: −53.32[1] mas/yr
Dec.: +18.87[1] mas/yr
Parallax (π)8.70 ± 0.30[1] mas
Distance370 ± 10 ly
(115 ± 4 pc)
Absolute magnitude (MV)−0.56[5]
Details
Radius47.84+0.49
−1.19[6] R☉
Luminosity491.9±22.3[6] L☉
Surface gravity (log g)1.68[7] cgs
Temperature3,930+50
−20[6] K
Metallicity [Fe/H]−0.08[5] dex
Other designations
ρ Ser, 38 Serpentis, NSV 7300, BD+21°2829, GC 21311, HD 141992, HIP 77661, HR 5899, SAO 84037[8]
Database references
SIMBADdata

This is an aging giant star with a stellar classification of K4.5III.[3] It is a suspected variable star of unknown type, with an I-band brightness ranging from 3.29 down to 3.44 magnitude.[10] Hipparcos photometry revealed a microvariability with a frequency of 0.17017 cycles per day and an amplitude of 0.0080.[11] With the supply of hydrogen exhausted at its core, it has expanded and now has 48[6] times the Sun's girth. The star is radiating 492[6] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 3,930 K.[6]

References
  1. 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. Vizier catalog entry
  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. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272
  5. 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.
  6. 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.
  7. McWilliam, Andrew (December 1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". Astrophysical Journal Supplement Series. 74: 1075–1128. Bibcode:1990ApJS...74.1075M. doi:10.1086/191527.
  8. "rho Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-17.
  9. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  10. Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085.
  11. Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331: 45. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x.
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