59 Serpentis

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59 Serpentis
59SerLightCurve.png
A light curve for 59 Serpentis, plotted from Hipparcos data [1]
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Serpens
Right ascension 18h 27m 12.50775s [2]
Declination +00° 11′ 45.9912″ [2]
Apparent magnitude  (V)5.17 –5.29 [3]
Characteristics
Spectral type A0Vs + G:III [2]
U−B color index +0.21 [4]
B−V color index +0.48 [4]
Variable type Irregular? [3]
Astrometry
Radial velocity (Rv)−23.3 [5] km/s
Proper motion (μ)RA: −3.67 [6] mas/yr
Dec.: −8.61 [6] mas/yr
Parallax (π)6.95±0.63  mas [6]
Distance 470 ± 40  ly
(140 ± 10  pc)
Absolute magnitude  (MV)−0.57 [7]
Details
Aa
Mass 6.32 [8]   M☉
Radius 13 [9]   R☉
Temperature 5,093 [10]   K
Age 316 [10]   Myr
Ab1
Mass 4.13 [8]   M☉
Radius 2.2 [9]   R☉
Temperature 9,700 [9]   K
Ab2
Mass 3.39 [8]   M☉
Radius 1.8 [9]   R☉
Temperature 9,700 [9]   K
Ba
Mass 3.17 [8]   M☉
Radius 1.7 [11]   R☉
Luminosity 10.1 [11]   L☉
Surface gravity (log g)4.28 [11]   cgs
Temperature 7,981 [11]   K
Other designations
59 Ser, d Ser, HIP 90441, HR  6918, BD+00°3936, ADS 11353, CCDM J18272+0012
A: HD  169985
B: HD  169985
Database references
SIMBAD data
A
B

59 Serpentis, also known as d Serpentis, is a multiple star in the constellation Serpens. [2] The system shows irregular variations in brightness between magnitudes 5.17 and 5.29. [3]

Components

59 Serpentis appears as a close pair of stars, of 5th magnitude and 7th magnitude respectively, separated by four arc-seconds. The brighter of the two is itself an even closer binary with the two stars separated by only 0.2″ , and only 0.1″ when they were first detected. The stars are designated Aa, Ab, and B. [12]

The primary star, component Aa, is a G0 giant. Component Ab is spectroscopic binary with a period of 1.85 days; the two stars are very similar A-class main sequence stars. Component B is an F5V possible astrometric binary, but with little known about the orbit or the possible companion. [8]

A much fainter star 20″ away is also thought to be a member of the system, having a common proper motion and similar parallax, and is designated as component C. [8]

The first detailed orbital solution for this triple system was published in 1943 by Elizabeth Cornwall Tilley. [9] Her work established that 59 Serpentis A consists of a G-type giant star (component Aa) and a close pair of two A-type main-sequence stars (forming component Ab).

Tilley's 1943 paper also provided the first estimates for the radii of the stars in the triple system: approximately 13 R☉ for the G-type giant, and 2.2 R☉ and 1.8 R☉ for the two A-type stars. [9]

References

  1. ↑ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  2. 1 2 3 4 "d Serpentis -- Double or multiple star". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg . Retrieved 2 July 2014.
  3. 1 2 3 VSX (4 January 2010). "d Serpentis". AAVSO Website. American Association of Variable Star Observers . Retrieved 25 May 2014.
  4. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
  6. 1 2 3 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.
  7. ↑ 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.
  8. 1 2 3 4 5 6 Tokovinin, Andrei (2018-03-01). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series . 235 (1): 6. arXiv: 1712.04750 . Bibcode:2018ApJS..235....6T. doi: 10.3847/1538-4365/aaa1a5 . ISSN   0067-0049. S2CID   119047709.
  9. 1 2 3 4 5 6 7 Tilley, Elizabeth Cornwall (1943). "A Spectrographic Study of the Triple System in 59 D Serpentis". The Astrophysical Journal. 98: 347. Bibcode:1943ApJ....98..347T. doi:10.1086/144577.
  10. 1 2 Parsons, Sidney B. (May 2004). "New and Confirmed Triple Systems with Luminous Cool Primaries and Hot Companions". The Astronomical Journal. 127 (5): 2915–2930. Bibcode:2004AJ....127.2915P. doi: 10.1086/383546 .
  11. 1 2 3 4 Stassun K.G.; et al. (October 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 . S2CID   166227927.
  12. ↑ Mason, Brian D.; et al. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 .
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