Astronomy:17 Leporis

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Short description: Star in the constellation Lepus
17 Leporis
SSLepLightCurve.png
A light curve for SS Leporis, plotted from Hipparcos data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Lepus
Right ascension  06h 04m 59.12945s[2]
Declination −16° 29′ 03.9692″[2]
Apparent magnitude (V) 4.82 to 5.06[3]
Characteristics
Spectral type A1V + M6III[4]
U−B color index +0.12 (combined)[5]
B−V color index +0.24 (combined)[5]
R−I color index +0.52 (combined)[5]
Variable type Z And[3]
Astrometry
Radial velocity (Rv)+18.74±0.10
(center of mass)[6] km/s
Proper motion (μ) RA: −5.955[2] mas/yr
Dec.: −3.680[2] mas/yr
Parallax (π)3.5742 ± 0.0992[2] mas
Distance910 ± 30 ly
(280 ± 8 pc)
Orbit[6]
Period (P)260.34±1.80 d
Semi-major axis (a)4.492±0.014 mas[4]
Eccentricity (e)0.005±0.003[4]
Inclination (i)143.7±0.5[4]°
Longitude of the node (Ω)162.2±0.7[4]°
Periastron epoch (T)2,448,528.78±0.37 HJD
Argument of periastron (ω)
(secondary)		203.7±0.4°
Semi-amplitude (K1)
(primary)		6.1±1.0 km/s
Semi-amplitude (K2)
(secondary)		21.32±0.21 km/s
Details
A-type star
Mass2.71±0.27[4] M☉
Radius18[7] R☉
Luminosity1,900[7] L☉
Surface gravity (log g)2.0[7] cgs
Temperature9,000[7] K
M giant
Mass1.30±0.33[4] M☉
Radius66.7±3.3[4] R☉
Luminosity1,200[7] L☉
Surface gravity (log g)1.0[7] cgs
Temperature3,250[7] K
Other designations
17 Lep, SS Lep, BD−16°1349, HD 41511, HIP 28816, HR 2148, SAO 151093[8]
Database references
SIMBADdata

17 Leporis is a binary star system in the southern constellation of Lepus.[7] It has an overall apparent visual magnitude which varies between 4.82 and 5.06,[3] making it luminous enough to be visible to the naked eye as a faint star. The variable star designation for this system is SS Leporis, while 17 Leporis is the Flamsteed designation. Parallax measurements yield a distance estimate of around 910 light years from the Sun. The system is moving further away from the Earth with a heliocentric radial velocity of +18.7 km/s.[6]

This is a double-lined spectroscopic binary system with an orbital period of 260 days and an eccentricity of 0.005.[6] The spectrum reveals the pair to consist of an A-type main-sequence star with a stellar classification of A1 V, and a red giant with a class of M6III. The close pair form a symbiotic binary with ongoing mass transfer from the giant to the hotter component. The giant does not appear to be filling its Roche lobe, so the mass transfer is coming from stellar wind off the giant. The pair are surrounded by a shell and a dusty circumbinary disk, with the former obliterating the lines from the A-type star.[4]

Gallery

  • This zoom sequence starts with a broad view of the spectacular Milky Way. It then closes in on the small constellation of Lepus (The Hare) and finally focuses on 17 Lep.

  • Wide field around SS Leporis. The field of view is approximately 2.7 degrees.

References

  1. ↑ "/ftp/cats/more/HIP/cdroms/cats". Strasbourg astronomical Data Center. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 "SS Lep, database entry". The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars. Moscow, Russia: Sternberg Astronomical Institute. http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 Blind, N. et al. (December 2011). "An incisive look at the symbiotic star SS Leporis. Milli-arcsecond imaging with PIONIER/VLTI". Astronomy & Astrophysics 536: 11. doi:10.1051/0004-6361/201118036. A55. Bibcode: 2011A&A...536A..55B. 
  5. ↑ 5.0 5.1 5.2 Hoffleit, D.; Warren, Jr., W. H.. "HR 2148 database entry, The Bright Star Catalogue". CDS. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=2148. Retrieved September 9, 2009. 
  6. ↑ 6.0 6.1 6.2 6.3 Welty, Alan D.; Wade, Richard A. (January 1995). "On the nature of 17 Leporis". The Astronomical Journal 109 (1669): 326–331. doi:10.1086/117276. Bibcode: 1995AJ....109..326W.  Seet Table 2.
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 Verhoelst, T.; van Aarle, E.; Acke, B. (August 2007). "§3.1, Direct diameter measurement of a star filling its Roche lobe. The semi-detached binary SS Leporis spatially resolved with VINCI/VLTI". Astronomy and Astrophysics 470 (3): L21–L24. doi:10.1051/0004-6361:20077840. Bibcode: 2007A&A...470L..21V. 
  8. ↑ "17 Lep". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=17+Lep. 



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