17 Leporis

{{Starbox image

| image = 280px

| caption = A light curve for SS Leporis, plotted from Hipparcos data

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Lepus

| ra = {{RA|06|04|59.12945}}

| dec = {{DEC|−16|29|03.9692}}

| appmag_v=4.82 to 5.06

}}

{{Starbox character

| class = {{nowrap|A1V + M6III}}

| u-b = +0.12 (combined)

| b-v = +0.24 (combined)

| r-i = +0.52 (combined)

| variable = Z And

}}

{{Starbox astrometry

| radial_v = {{val|+18.74|0.10}}
(center of mass)

| prop_mo_ra = −5.955

| prop_mo_dec = −3.680

| parallax = 3.5742

| p_error = 0.0992

| parallax_footnote =

| absmag_v=

}}

{{Starbox orbit

| reference =

| period_unitless = {{val|260.34|1.80|u=days}}

| axis_unitless = {{Val|4.492|0.014|ul=mas}}

| eccentricity = {{val|0.005|0.003}}

| inclination = {{Val|143.7|0.5}}

| node = {{Val|162.2|0.7}}

| periastron = {{val|2448528.78|0.37|ul=HJD|fmt=commas}}

| periarg = {{Val|203.7|0.4}}

| k1 = {{Val|6.1|1.0}}

| k2 = {{Val|21.32|0.21}}

}}

{{Starbox detail

| source=

| component1=A-type star

| mass={{Val|2.71|0.27}}

| radius=18

| temperature=9,000

| luminosity=1,900

| gravity=2.0

| component2=M giant

| mass2={{Val|1.30|0.33}}

| radius2={{Val|66.7|3.3}}

| temperature2=3,250

| luminosity2=1,200

| gravity2=1.0

}}

{{Starbox catalog

| names={{odlist | F=17 Lep | V=SS Lep | BD=−16°1349 | HD=41511 | HIP=28816 | HR=2148 | SAO=151093 }}

}}

{{Starbox reference

| Simbad=17+Lep

}}

17 Leporis is a binary star system in the southern constellation of Lepus. It has an overall apparent visual magnitude which varies between 4.82 and 5.06, 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.

This is a double-lined spectroscopic binary system with an orbital period of 260 days and an eccentricity of 0.005. 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.

Gallery

{{gallery|mode=nolines|align=center

|File:Zooming in on the unusual double star SS Leporis.ogv|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.

|File:Wide field SS Leporis.jpg | Wide field around SS Leporis. The field of view is approximately 2.7 degrees.

}}

References

{{reflist|refs=

{{cite web

| url=https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats

| website=Centre de Données astronomiques de Strasbourg | title=/ftp/cats/more/HIP/cdroms/cats

| publisher=Strasbourg astronomical Data Center |access-date=15 October 2022}}

{{cite web

| title=SS Lep, database entry

| url=http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat

| work=The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars

| publisher=Sternberg Astronomical Institute

| location=Moscow, Russia

| access-date=September 9, 2009

| archive-date=June 20, 2017

| archive-url=https://web.archive.org/web/20170620004609/http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat

| url-status=dead

}}

{{cite journal

| title=§3.1, Direct diameter measurement of a star filling its Roche lobe. The semi-detached binary SS Leporis spatially resolved with VINCI/VLTI

| journal=Astronomy and Astrophysics

| volume=470 | issue=3 | date=August 2007 | pages=L21–L24

| doi=10.1051/0004-6361:20077840 | bibcode=2007A&A...470L..21V | arxiv=0705.4410 | s2cid=14471349 }}

{{cite web

| url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=2148

| title=HR 2148 database entry, The Bright Star Catalogue

| edition=5th Revised (Preliminary Version)

| first1=D. | last1=Hoffleit | first2=W. H. | last2=Warren, Jr.

| publisher=CDS

| accessdate=September 9, 2009 }}

{{cite journal

| first1=Alan D. | last1=Welty | first2=Richard A. | last2=Wade

| title=On the nature of 17 Leporis

| journal=The Astronomical Journal

| volume=109 | issue=1669 | date=January 1995 | pages=326–331

| doi=10.1086/117276 | bibcode=1995AJ....109..326W| doi-access=free }} Seet Table 2.

{{cite journal

| title=An incisive look at the symbiotic star SS Leporis. Milli-arcsecond imaging with PIONIER/VLTI

| display-authors=1 | last1=Blind | first1=N.

| last2=Boffin | first2=H. M. J. | last3=Berger | first3=J.-P.

| last4=Le Bouquin | first4=J.-B. | last5=Mérand | first5=A.

| last6=Lazareff | first6=B. | last7=Zins | first7=G.

| journal=Astronomy & Astrophysics

| volume=536 | id=A55 | pages=11 | date=December 2011

| doi=10.1051/0004-6361/201118036

| bibcode=2011A&A...536A..55B | arxiv=1112.1514 | s2cid=118482471 }}

}}

Category:A-type main-sequence stars

Category:M-type giants

Category:Emission-line stars

Category:Circumstellar disks

Category:Lepus (constellation)

Category:Articles containing video clips

Category:Spectroscopic binaries