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References: consistent cite style (cs1, definitions in reflist)

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{{Short description|Multiple star in the constellation Aries}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000
| constell = [[Aries (constellation)|Aries]]<ref name=Anderson2012/>
| ra = {{RA|02|43|51.24421}}<ref name=vanLeeuwen2007/>
| dec = {{DEC|+25|38|18.0493}}<ref name=vanLeeuwen2007/>
| appmag_v = 6.376<ref name=Murphy2017/>
}}
{{Starbox character
| type = [[main sequence]]<ref name=lambert2004/>
| class = A3 V<ref name=Cowley1969/>
| b-v = {{Val|0.089|0.002}}<ref name=Anderson2012/>
| u-b =
}}
{{Starbox astrometry
| radial_v = {{Val|-10.3|3.1}}<ref name=Gontcharov2006/>
| prop_mo_ra = {{Val|−4.98|0.70}}<ref name=vanLeeuwen2007/>
| prop_mo_dec = {{Val|+6.04|0.52}}<ref name=vanLeeuwen2007/>
| parallax = 9.59
| p_error = 0.76
| parallax_footnote = <ref name=vanLeeuwen2007/>
| absmag_v = {{Val|+1.18|0.13}}<ref name=Murphy2017/>
}}
{{Starbox detail
| source =
| component1 = HD 16955 A
| mass = {{Val|2.25|0.08}}<ref name=zorec2012/>
| radius = 2.4<ref name=schofield2019/>
| luminosity = {{Val|26.9|3.3|2.9}}<ref name=Murphy2017/>
| gravity = 3.97<ref name=ag2018/>
| temperature = {{Val|8450|164|fmt=commas}}<ref name=Murphy2017/>
| metal_fe =
| rotational_velocity = 175<ref name=Royer2007/>
| age_gyr = 1.6<ref name=ag2018/>
}}
{{Starbox catalog
| names = {{odlist | BD=+25°441 | FK5= | HD=16955 | HIP=12744 | HR=803 | SAO=75539 }}<ref name=SIMBAD/>
}}
{{Starbox reference
| Simbad = HD+16955
}}
{{Starbox end}}

'''HD 16955''', also known as '''HR 803''', is a double or multiple star. With an [[apparent visual magnitude]] of 6.376,<ref name=Murphy2017/> is lies at or below the nominal limit for visibility with a typical naked eye. The measured annual [[stellar parallax|parallax shift]] is 9.59 [[milliarcsecond]]s, which yields an estimated distance of around 340 [[light year]]s. The star is moving closer to the Sun with a heliocentric [[radial velocity]] of around -10 km/s.<ref name=Gontcharov2006/>

This is an [[A-type main-sequence star]] with a [[stellar classification]] of A3 V.<ref name=Cowley1969/> Hauck et al. (1995) identified this as a [[Lambda Boötis star]] with a circumstellar shell,<ref name=Hauck1995/> but this now appears to be unlikely.<ref name=Murphy2017/> It has 2.25<ref name=zorec2012/> times the [[mass of the Sun]] and is spinning rapidly with a [[projected rotational velocity]] of 175 km/s.<ref name=Royer2007/> The star is radiating about 27<ref name=Murphy2017/> times the [[Sun's luminosity]] from its [[photosphere]] at an [[effective temperature]] of roughly 8,450 K.<ref name=Murphy2017/>

HD 16955 has a magnitude 10.36 companion, component B, which is located, as of 2015, at an [[angular separation]] of 3.0 [[arcsecond]]s along a [[position angle]] of 19°.<ref name=Mason2014/> This is the likely source for the detected [[X-ray astronomy|X-ray emission]] with a luminosity of {{Val|262.5e20|u=W}} coming from these coordinates, since A-type stars are not expected to emit X-rays.<ref name=Schroeder2007/> Component C is a more distant magnitude 12.94 companion located at a separation of 51.10 arcseconds along a position angle of 92°, as of 2015.<ref name=Mason2014/>

==References==
{{reflist|refs=

<ref name=ag2018>{{cite journal
| display-authors=1 | last1=Aguilera-Gómez | first1=Claudia
| last2=Ramírez | first2=Iván | last3=Chanamé | first3=Julio
| title=Lithium abundance patterns of late-F stars: An in-depth analysis of the lithium desert
| journal=Astronomy and Astrophysics
| volume=614 | pages=A55 | year=2018
| bibcode=2018A&A...614A..55A | arxiv=1803.05922
| doi=10.1051/0004-6361/201732209 | s2cid=62799777 }}</ref>

<ref name=schofield2019>{{cite journal
| title=The Asteroseismic Target List for Solar-like Oscillators Observed in 2 minute Cadence with the Transiting Exoplanet Survey Satellite
| last1=Schofield | first1=Mathew | last2=Chaplin | first2=William J.
| last3=Huber | first3=Daniel | last4=Campante | first4=Tiago L.
| last5=Davies | first5=Guy R. | last6=Miglio | first6=Andrea
| last7=Ball | first7=Warrick H. | last8=Appourchaux | first8=Thierry
| last9=Basu | first9=Sarbani | last10=Bedding | first10=Timothy R.
| last11=Christensen-Dalsgaard | first11=Jørgen | last12=Creevey | first12=Orlagh
| last13=García | first13=Rafael A. | last14=Handberg | first14=Rasmus
| last15=Kawaler | first15=Steven D. | last16=Kjeldsen | first16=Hans
| last17=Latham | first17=David W. | last18=Lund | first18=Mikkel N.
| last19=Metcalfe | first19=Travis S. | last20=Ricker | first20=George R.
| last21=Serenelli | first21=Aldo | last22=Silva Aguirre | first22=Victor
| last23=Stello | first23=Dennis | last24=Vanderspek | first24=Roland
| display-authors=1 | journal=The Astrophysical Journal Supplement Series
| date=2019 | volume=241 | issue=1 | page=12
| doi=10.3847/1538-4365/ab04f5 | doi-access=free
| bibcode=2019ApJS..241...12S | arxiv=1901.10148 }}</ref>

<ref name=lambert2004>{{cite journal | last1=Lambert | first1=David L. | last2=Reddy | first2=Bacham E. | title=Lithium abundances of the local thin disc stars | journal=Monthly Notices of the Royal Astronomical Society | volume=349 | issue=2 | date=2004 | doi=10.1111/j.1365-2966.2004.07557.x | s2cid = 118931004 | pages=757–767 | bibcode = 2004MNRAS.349..757L | arxiv = astro-ph/0401259 | doi-access = free}}</ref>

<ref name=vanLeeuwen2007>{{cite journal
| title=Validation of the new Hipparcos reduction
| last1=van Leeuwen | first1=F.
| journal=Astronomy and Astrophysics
| volume=474 | issue=2 | pages=653–664 | year=2007
| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357 | s2cid=18759600 }}</ref>

<ref name=Anderson2012>{{cite XHIP|12744}}</ref>

<ref name=Gontcharov2006>{{cite journal
| last1=Gontcharov | first1=G. A.
| title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system
| journal=Astronomy Letters | volume=32 | issue=11 | pages=759–771 | date=November 2006
| doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G
| arxiv=1606.08053 | s2cid=119231169
}}</ref>

<ref name=Mason2014>{{cite journal
| display-authors=1 | last1=Mason | first1=B. D.
| last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I.
| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.
| title=The Washington Visual Double Star Catalog | year=2014
| bibcode=2001AJ....122.3466M | doi=10.1086/323920
| volume=122 | issue=6 | journal=The Astronomical Journal | pages=3466–3471 | doi-access=free }}</ref>

<ref name=Hauck1995>{{cite journal
| title=Three other λ Bootis stars with a shell
| display-authors=1 | last1=Hauck | first1=B.
| last2=Ballereau | first2=D. | last3=Chauville | first3=J.
| journal=Astronomy and Astrophysics Supplement
| volume=109 | pages=505−510 | date=March 1995
| bibcode=1995A&AS..109..505H }}</ref>

<ref name=Schroeder2007>{{cite journal
| title=X-ray emission from A-type stars
| last1=Schröder | first1=C. | last2=Schmitt | first2=J. H. M. M.
| journal=Astronomy and Astrophysics
| volume=475 | issue=2 | date=November 2007 | pages=677−684
| doi=10.1051/0004-6361:20077429 | bibcode=2007A&A...475..677S | doi-access=free }}</ref>

<ref name=zorec2012>{{cite journal
| title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities
| journal=Astronomy & Astrophysics
| last1=Zorec | first1=J. | last2=Royer | first2=F.
| volume=537 | pages=A120 | year=2012
| doi=10.1051/0004-6361/201117691
| bibcode=2012A&A...537A.120Z | arxiv=1201.2052 | s2cid=55586789
}}</ref>

<ref name=Royer2007>{{cite journal
| display-authors=1 | last1=Royer | first1=F.
| last2=Zorec | first2=J. | last3=Gómez | first3=A. E.
| title=Rotational velocities of A-type stars. III. Velocity distributions
| journal=Astronomy and Astrophysics
| volume=463 | issue=2 | pages=671–682 | date=February 2007
| doi=10.1051/0004-6361:20065224 | bibcode=2007A&A...463..671R
| arxiv=astro-ph/0610785 | s2cid=18475298 }}</ref>

<ref name=Murphy2017>{{cite journal
| title=Gaia's view of the λ Boo star puzzle
| last1=Murphy | first1=Simon J. | last2=Paunzen | first2=Ernst
| journal=Monthly Notices of the Royal Astronomical Society
| volume=466 | issue=1 | pages=546−555 | date=April 2017
| doi=10.1093/mnras/stw3141 | doi-access=free | bibcode=2017MNRAS.466..546M | arxiv=1612.01528| s2cid=119328659 }}</ref>

<ref name=Cowley1969>{{cite journal
| last1=Cowley | first1=A. | last2=Cowley | first2=C.
| last3=Jaschek | first3=M. | last4=Jaschek | first4=C.
| title=A study of the bright A stars. I. A catalogue of spectral classifications
| journal=Astronomical Journal | display-authors=1
| volume=74 | pages=375–406 | date=April 1969
| doi=10.1086/110819 | bibcode=1969AJ.....74..375C }}</ref>

<ref name=SIMBAD>{{cite simbad | title=HD 16955 | access-date=2018-02-26 }}</ref>

}}

{{Stars of Aries}}

{{DEFAULTSORT:HD 16955}}
[[Category:A-type main-sequence stars]]
[[Category:Lambda Boötis stars]]
[[Category:Double stars]]
[[Category:Aries (constellation)]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|016955]]
[[Category:Hipparcos objects|012744]]
[[Category:Bright Star Catalogue objects|0803]]

HD 16955 - Revision history

imported>Lithopsian: /* References */ consistent cite style (cs1, definitions in reflist)