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Omicron Serpentis
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Serpens
Right ascension 17h 41m 24.87286s [1]
Declination −12° 52′ 31.1086″ [1]
Apparent magnitude (V) 4.26 [2]
Characteristics
Spectral type A2 Va [3]
U−B color index +0.08 [2]
B−V color index +0.07 [2]
Variable type δ Sct [4]
Astrometry
Radial velocity (Rv)−30.2±1.2 [5] km/s
Proper motion (μ) RA: −72.90 [1]  mas/ yr
Dec.: −55.55 [1]  mas/ yr
Parallax (π)18.83 ± 0.25  mas [1]
Distance173 ± 2  ly
(53.1 ± 0.7  pc)
Absolute magnitude (MV)+0.760 [6]
Details
Mass2.13 [7]  M☉
Radius2.2 [8]  R☉
Luminosity42.6 [9]  L☉
Surface gravity (log g)3.82±0.14 [7]  cgs
Temperature8,972±305 [7]  K
Rotational velocity (v sin i)112.6±1.2 [10] km/s
Age518 [7]  Myr
Other designations
ο Ser, 56 Ser, BD−12° 4808, FK5 3405, HD 160613, HIP 86565, HR 6581, SAO 160747. [11]
Database references
SIMBAD data

Omicron Serpentis (ο Ser, ο Serpentis) is a solitary [12] star in the Serpens Cauda (tail) section of the equatorial constellation Serpens. Based upon an annual parallax shift of 18.83  mas as seen from Earth, [1] it is located around 173  light years from the Sun. The star is visible to the naked eye with a base apparent visual magnitude of +4.26. [2]

This is a white-hued A-type main sequence star with a stellar classification of A2 Va. [3] It is located on the lower instability strip [6] and is classified as a Delta Scuti type variable star. The apparent magnitude of the star varies in the range 4.26−4.27 with a period of 76 minutes, or 0.053 days. [6] [13]

The star has an estimated 2.13 [7] times the mass of the Sun and about 2.2 [8] times the Sun's radius. It is about half a billion [7] years old and is spinning with a projected rotational velocity of 112.6 km/s. [10] Omicron Serpentis is radiating 42.6 [9] times the solar luminosity from its photosphere at an effective temperature of 8,972 K. [7]

In 1909, the symbiotic nova [14] RT Serpentis appeared near Omicron, although it only reached a maximum magnitude of 10. [15]

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.
  2. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode: 1986EgUBV........0M.
  3. ^ a b Houk, N. (1988), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H.
  4. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009), "General Catalogue of Variable Stars (Samus+ 2007-2013)", VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S, 1, Bibcode: 2009yCat....102025S.
  5. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv: 1208.3048, Bibcode: 2012A&A...546A..61D, doi: 10.1051/0004-6361/201219219, S2CID  59451347, A61.
  6. ^ a b c Garcia, J. R.; et al. (February 1995), "A catalogue of variable stars in the lower instability strip", Astronomy and Astrophysics Supplement, 109: 201–262, Bibcode: 1995A&AS..109..201G.
  7. ^ a b c d e f g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv: 1501.03154, Bibcode: 2015ApJ...804..146D, doi: 10.1088/0004-637X/804/2/146, S2CID  33401607.
  8. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv: astro-ph/0012289, Bibcode: 2001A&A...367..521P, doi: 10.1051/0004-6361:20000451, S2CID  425754.
  9. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv: 1208.2037, Bibcode: 2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x, S2CID  118665352.
  10. ^ a b Díaz, C. G.; et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics, 531: A143, arXiv: 1012.4858, Bibcode: 2011A&A...531A.143D, doi: 10.1051/0004-6361/201016386, S2CID  119286673.
  11. ^ "omi Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-23.{{ cite web}}: CS1 maint: postscript ( link)
  12. ^ 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, S2CID  14878976.
  13. ^ Chang, S.-W.; et al. (2013), "Statistical Properties of Galactic δ Scuti Stars: Revisited", The Astronomical Journal, 145 (5): 132, arXiv: 1303.1031, Bibcode: 2013AJ....145..132C, doi: 10.1088/0004-6256/145/5/132, S2CID  118900730.
  14. ^ Pavlenko, E. P.; Bochkov, V. V.; Vasil'yanovskaya, O. P. (1996). "9,6-Year periodicity of symbiotic nova RT Ser (1909) during the outburst decay from 1940 to 1994". Astrophysics. 39 (1): 15–19. Bibcode: 1996Ap.....39...15P. doi: 10.1007/BF02044949. S2CID  120532937.
  15. ^ VSX; Osborne, W. (1 April 2014). "RT Serpentis". AAVSO Website. American Association of Variable Star Observers. Retrieved 28 May 2014.
Retrieved from " https://en.wikipedia.org/?title=Omicron_Serpentis&oldid=1154724717"
From Wikipedia, the free encyclopedia
Omicron Serpentis
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Serpens
Right ascension 17h 41m 24.87286s [1]
Declination −12° 52′ 31.1086″ [1]
Apparent magnitude (V) 4.26 [2]
Characteristics
Spectral type A2 Va [3]
U−B color index +0.08 [2]
B−V color index +0.07 [2]
Variable type δ Sct [4]
Astrometry
Radial velocity (Rv)−30.2±1.2 [5] km/s
Proper motion (μ) RA: −72.90 [1]  mas/ yr
Dec.: −55.55 [1]  mas/ yr
Parallax (π)18.83 ± 0.25  mas [1]
Distance173 ± 2  ly
(53.1 ± 0.7  pc)
Absolute magnitude (MV)+0.760 [6]
Details
Mass2.13 [7]  M☉
Radius2.2 [8]  R☉
Luminosity42.6 [9]  L☉
Surface gravity (log g)3.82±0.14 [7]  cgs
Temperature8,972±305 [7]  K
Rotational velocity (v sin i)112.6±1.2 [10] km/s
Age518 [7]  Myr
Other designations
ο Ser, 56 Ser, BD−12° 4808, FK5 3405, HD 160613, HIP 86565, HR 6581, SAO 160747. [11]
Database references
SIMBAD data

Omicron Serpentis (ο Ser, ο Serpentis) is a solitary [12] star in the Serpens Cauda (tail) section of the equatorial constellation Serpens. Based upon an annual parallax shift of 18.83  mas as seen from Earth, [1] it is located around 173  light years from the Sun. The star is visible to the naked eye with a base apparent visual magnitude of +4.26. [2]

This is a white-hued A-type main sequence star with a stellar classification of A2 Va. [3] It is located on the lower instability strip [6] and is classified as a Delta Scuti type variable star. The apparent magnitude of the star varies in the range 4.26−4.27 with a period of 76 minutes, or 0.053 days. [6] [13]

The star has an estimated 2.13 [7] times the mass of the Sun and about 2.2 [8] times the Sun's radius. It is about half a billion [7] years old and is spinning with a projected rotational velocity of 112.6 km/s. [10] Omicron Serpentis is radiating 42.6 [9] times the solar luminosity from its photosphere at an effective temperature of 8,972 K. [7]

In 1909, the symbiotic nova [14] RT Serpentis appeared near Omicron, although it only reached a maximum magnitude of 10. [15]

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.
  2. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode: 1986EgUBV........0M.
  3. ^ a b Houk, N. (1988), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode: 1988mcts.book.....H.
  4. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009), "General Catalogue of Variable Stars (Samus+ 2007-2013)", VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S, 1, Bibcode: 2009yCat....102025S.
  5. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv: 1208.3048, Bibcode: 2012A&A...546A..61D, doi: 10.1051/0004-6361/201219219, S2CID  59451347, A61.
  6. ^ a b c Garcia, J. R.; et al. (February 1995), "A catalogue of variable stars in the lower instability strip", Astronomy and Astrophysics Supplement, 109: 201–262, Bibcode: 1995A&AS..109..201G.
  7. ^ a b c d e f g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv: 1501.03154, Bibcode: 2015ApJ...804..146D, doi: 10.1088/0004-637X/804/2/146, S2CID  33401607.
  8. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv: astro-ph/0012289, Bibcode: 2001A&A...367..521P, doi: 10.1051/0004-6361:20000451, S2CID  425754.
  9. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv: 1208.2037, Bibcode: 2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x, S2CID  118665352.
  10. ^ a b Díaz, C. G.; et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics, 531: A143, arXiv: 1012.4858, Bibcode: 2011A&A...531A.143D, doi: 10.1051/0004-6361/201016386, S2CID  119286673.
  11. ^ "omi Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-23.{{ cite web}}: CS1 maint: postscript ( link)
  12. ^ 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, S2CID  14878976.
  13. ^ Chang, S.-W.; et al. (2013), "Statistical Properties of Galactic δ Scuti Stars: Revisited", The Astronomical Journal, 145 (5): 132, arXiv: 1303.1031, Bibcode: 2013AJ....145..132C, doi: 10.1088/0004-6256/145/5/132, S2CID  118900730.
  14. ^ Pavlenko, E. P.; Bochkov, V. V.; Vasil'yanovskaya, O. P. (1996). "9,6-Year periodicity of symbiotic nova RT Ser (1909) during the outburst decay from 1940 to 1994". Astrophysics. 39 (1): 15–19. Bibcode: 1996Ap.....39...15P. doi: 10.1007/BF02044949. S2CID  120532937.
  15. ^ VSX; Osborne, W. (1 April 2014). "RT Serpentis". AAVSO Website. American Association of Variable Star Observers. Retrieved 28 May 2014.
Retrieved from " https://en.wikipedia.org/?title=Omicron_Serpentis&oldid=1154724717"

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