15 Camelopardalis

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15 Camelopardalis
DVCamLightCurve.png
A Hipparcos light curve for DV Camelopardalis, adapted from Bakiş et al. (2011) [1]
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Camelopardalis
Right ascension 05h 19m 27.85996s [2]
Declination +58° 07′ 02.5203″ [2]
Apparent magnitude  (V)6.13 [3]
Characteristics
Spectral type B5 V [4]
B−V color index −0.031±0.005 [3]
Variable type Algol, [5] SPB [6]
Astrometry
Radial velocity (Rv)6.7±3.7 [3]  km/s
Proper motion (μ)RA: +5.558 [2]   mas/yr
Dec.: −18.832 [2]   mas/yr
Parallax (π)3.1406 ± 0.0571  mas [2]
Distance 1,040 ± 20  ly
(318 ± 6  pc)
Absolute magnitude  (MV)−0.74 [3]
Orbit [5]
Period (P)6.6784±0.0010 d
Eccentricity (e)~0.48
Details
Luminosity 220.01 [3]   L☉
Other designations
15 Cam, DV Cam, BD+57°874, HD  34233, HIP  24836, HR  1719, SAO  25125 [7]
Database references
SIMBAD data

15 Camelopardalis is a triple star [5] system in the northern circumpolar constellation of Camelopardalis. It has the variable star designation DV Camelopardalis; 15 Camelopardalis is the Flamsteed designation. This is just visible to the naked eye as a dim, blue-white hued star with a baseline apparent visual magnitude of 6.13. [3] It is a probable (99%) member of the Cas-Tau OB association. [5]

This system includes a double-lined spectroscopic binary with an orbital period of 6.7 days and a large eccentricity of around 0.48, plus a third component in a wider orbit. The close pair consist of a very slowly rotating helium-weak star plus an ordinary mid-B-type star with a more rapid rotation rate. [6] When the Hipparcos data was analyzed, it was discovered that together they form an Algol-type eclipsing binary with a depth of about 0.2 magnitude. [5] [8] The third component is a slowly pulsating B-type star. [6]

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LL Aquarii is an eclipsing binary star system in the equatorial constellation of Aquarius, abbreviated LL Aqr. At peak brightness it has a combined apparent visual magnitude of 9.23, which is too dim to be visible to the naked eye. Based on parallax measurements, it is located at a distance of approximately 447 light years from the Sun. The system is drifting closer with a heliocentric radial velocity of about −10 km/s.

References

  1. ↑ Bakiş, V.; Hensberge, H.; Zejda, M.; de Cat, P.; Yılmaz, F.; Bloemen, S.; Svoboda, P.; Demircan, O. (April 2012). "Northern Binaries in the Evrena Project". From Interacting Binaries to Exoplanets: Essential Modeling Tools Proceedings IAU Symposium No. 282. 282: 71–72. Bibcode:2012IAUS..282...71B. doi: 10.1017/S1743921311026949 . Retrieved 9 November 2021.
  2. 1 2 3 4 5 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.
  3. 1 2 3 4 5 6 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.
  4. ↑ Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement, 17: 371, Bibcode:1968ApJS...17..371L, doi: 10.1086/190179
  5. 1 2 3 4 5 Bakış, V.; et al. (April 2012), "Northern Binaries in the Evrena Project", in Richards, M. T.; Hubeny, I. (eds.), From Interacting Binaries to Exoplanets: Essential Modeling Tools, Proceedings of the International Astronomical Union, vol. 282, pp. 71–72, Bibcode:2012IAUS..282...71B, doi: 10.1017/S1743921311026949 .
  6. 1 2 3 Hensberge, H.; et al. (February 25, 2014), Pavlovski, K.; Tkachenko, A.; Torres, G. (eds.), "The triple B–star system DV Cam", Setting a New Standard in the Analysis of Binary Stars, EAS Publications Series, vol. 64, pp. 397–398, doi:10.1051/eas/1364063.
  7. ↑ "15 Cam". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-04-16.
  8. ↑ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4659: 1–27. Bibcode:1999IBVS.4659....1K . Retrieved 30 December 2024.
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