7 Camelopardalis

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7 Camelopardalis
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Camelopardalis
Right ascension 04h 57m 17.19609s [1]
Declination +53° 45′ 07.5654″ [1]
Apparent magnitude  (V)4.43 [2] (4.49 + ? + 7.90 + 11.30) [3]
Characteristics
Evolutionary stage main sequence
Spectral type A1 V [4]
B−V color index −0.017±0.003 [2]
Astrometry
Radial velocity (Rv)−9.5±3.7 [5]  km/s
Proper motion (μ)RA: −24.51 [1]   mas/yr
Dec.: +7.71 [1]   mas/yr
Parallax (π)8.77 ± 0.60  mas [1]
Distance 370 ± 30  ly
(114 ± 8  pc)
Absolute magnitude  (MV)−0.84 [2]
Orbit [6]
Primary7 Cam Aa
Companion7 Cam Ab
Period (P)3.884 d
Eccentricity (e)0
Periastron epoch (T)2,457,726.05  JD
Argument of periastron (ω)
(secondary)		0°
Semi-amplitude (K1)
(primary)		34.9±0.2 km/s
Details
7 Cam Aa
Mass 3.16±0.10 [7]   M☉
Luminosity 221.6+36.8
−31.5 [7]   L☉
Temperature 9,226+236
−231 [7]   K
Rotational velocity (v sin i)40 [7]  km/s
Other designations
7 Cam, BD+53°829, GC  6017, HD  31278, HIP  23040, HR  1568, SAO  24929, ADS  3536, WDS J04573+5345 [8]
Database references
SIMBAD data

7 Camelopardalis is a multiple star system [9] in the northern circumpolar constellation of Camelopardalis. It is located approximately 370 light years from the Sun, as determined from its parallax. [1] This system is visible to the naked eye as a faint, white-hued star with a combined apparent visual magnitude of 4.43. [2] It is moving closer to the Earth with a heliocentric radial velocity of −10 km/s. [5]

The primary member of the group, designated component A, is a single-lined spectroscopic binary system with a circular orbit and a period of 3.88 days. [6] The visible component of this pair is a magnitude 4.49 [3] A-type main-sequence star with a stellar classification of A1 V. [4] It has 3.2 times the mass of the Sun and is spinning with a projected rotational velocity of 40 km/s. The star is radiating 222 times the Sun's luminosity from its photosphere at an effective temperature of 9,226 K. [7]

The magnitude 7.90 [3] component B has an orbital solution with the Aa/Ab pair, which yields a period of 284 years and an eccentricity of 0.74. However, Drummond (2014) found the data to be discordant and instead determined that they are an optical pair with no physical association. [10] The fourth member, component C, is a magnitude 11.30 star at an angular separation of 25.50″ along a position angle of 242° from the primary, as of 2003. [3] It shares a common proper motion with the primary star. [11]

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53 Ophiuchi is a multiple star system in the equatorial constellation of Ophiuchus. It is visible to the naked eye as a faint star with a combined apparent visual magnitude of 5.80. Located around 370 light years distant from the Sun based on parallax, it is moving closer to the Earth with a heliocentric radial velocity of −14 km/s. As of 2011, the visible components had an angular separation of 41.28″ along a position angle of 190°. The primary may itself be a close binary system with a separation of 0.3692″ and a magnitude difference of 3.97 at an infrared wavelength of 562 nm.

19 Lyncis is a triple star system in the northern constellation of Lynx. A telescope reveals it consists of two blue-white hued stars of magnitudes 5.80 and 6.86 that are 14.750 arcseconds apart, with a visual companion of magnitude 7.6 that is 3.5 arcminutes distant. The first two are located around 680–690 light years away from the Sun, based on parallax measurements. Their radial velocity measurements are poorly constrained, but suggest the system is trending away from the Earth.

References

  1. 1 2 3 4 5 6 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. 1 2 3 4 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.
  3. 1 2 3 4 Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi: 10.1086/323920 .
  4. 1 2 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  5. 1 2 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. 1 2 Heyne, T.; Mugrauer, M.; Bischoff, R.; Wagner, D.; Hoffmann, S.; Lux, O.; Munz, V.; Geymeier, M.; Neuhäuser, R. (2020). "Spectroscopic characterization of nine binary star systems as well as HIP 107136 and HIP 107533". Astronomische Nachrichten. 341 (1): 99–117. arXiv: 1912.05343 . Bibcode:2020AN....341...99H. doi:10.1002/asna.202013683. S2CID   209202812.
  7. 1 2 3 4 5 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv: 1201.2052 , Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID   55586789.
  8. ↑ "7 Cam". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-04-15.
  9. ↑ Eggleton, P. P.; et al. (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.
  10. ↑ Drummond, Jack D. (March 2014), "Binary Stars Observed with Adaptive Optics at the Starfire Optical Range", The Astronomical Journal, 147 (3): 10, Bibcode:2014AJ....147...65D, doi: 10.1088/0004-6256/147/3/65 , 65.
  11. ↑ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv: 2012.01533 . Bibcode:2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
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