6 Equulei

{{Starbox begin

|name = 6 Equulei

}}

{{Starbox observe

|epoch = J2000.0 (ICRS)

|constell = Equuleus

|ra = {{RA|21|10|31.31996}}

|dec = {{DEC|10|02|56.1180}}

|appmag_v = 6.07

}}

{{Starbox character

|type = main sequence

|class = A2 Vs ({{nowrap|A1 Si Sr Cr}})

|b-v = +0.02

|u-b = +0.04

|variable =

}}

{{Starbox astrometry

|radial_v = +6.9

|prop_mo_ra = –2.696

|prop_mo_dec = +15.802

|parallax = 8.5862

|p_error = 0.1086

|parallax_footnote =

|absmag_v = +0.236

}}

{{Starbox detail

|radius = 1.7

|mass = {{Val|2.59|0.14}}

|luminosity = {{Val|70.6|19.4|15.2}}

|temperature = {{Val|9078|169|165|fmt=commas}}

|metal_fe =

|gravity =

|rotational_velocity = 65

|age_myr = 970

}}

{{Starbox catalog

|names = {{odlist | B=γ Equulei D | BD=+09°4735 | HD=201616 | HIP=104538 | HR=8098 | SAO=126597 }}

}}

{{Starbox reference

|Simbad = 6+Equ

}}

6 Equulei is a probable (95% chance) astrometric binary star system in the northern constellation of Equuleus, located 380 light years from the Sun. It is barely visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 6.07. The system is moving further away from the Earth with a heliocentric radial velocity of +6.9 km/s. It forms a wide optical double with γ Equulei, at an angular separation of 336 arcseconds in 2011.

The visible component is an Ap star with a stellar classification of A2Vs, matching the evolutionary state of an A-type main sequence star while displaying "sharp" absorption lines. It is an estimated 970 million years old with a projected rotational velocity of 65 km/s. The star has 2.6 times the mass of the Sun and around 1.7 times the Sun's radius. It is radiating 71 times the luminosity of the Sun from its photosphere at an effective temperature of 9,078 K.

References

{{reflist|refs=

{{citation | last1=Renson | first1=P. | last2=Manfroid | first2=J. | title=Catalogue of Ap, HgMn and Am stars | journal=Astronomy and Astrophysics | volume=498 | issue=3 | pages=961–966 |date=May 2009 | doi=10.1051/0004-6361/200810788 | bibcode=2009A&A...498..961R | postscript=. | doi-access=free }}

{{citation | last=Wilson | first=Ralph Elmer | year=1953 | title=General Catalogue of Stellar Radial Velocities | journal=Carnegie Institute Washington D.C. Publication | publisher=Carnegie Institution of Washington | location=Washington | bibcode=1953GCRV..C......0W | postscript=. }}

{{citation | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | page=99 | bibcode=1966CoLPL...4...99J }}

{{citation | display-authors=1 | last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L. | last3=Covino | first3=S. | last4=Pozzi | first4=A. | title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics | journal=Astronomy and Astrophysics | volume=367 | pages=521–524 |date=February 2001 | issue=2 | doi=10.1051/0004-6361:20000451 | bibcode=2001A&A...367..521P | arxiv=astro-ph/0012289 | s2cid=425754 | postscript=. }}

{{citation | title=6 Equ -- Star in double system | work=SIMBAD Astronomical Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=6+Equulei | access-date=2012-07-25 | postscript=. }}

{{citation | title=HD 104538 | work=WolframAlpha | url=http://www.wolframalpha.com/input/?i=6+Equulei | access-date=2012-08-05 }}

{{citation | last1=Frankowski | first1=A. | last2=Jancart | first2=S. | last3=Jorissen | first3=A. | title=Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data | journal=Astronomy and Astrophysics | volume=464 | issue=1 | pages=377–392 |date=March 2007 | doi=10.1051/0004-6361:20065526 | bibcode=2007A&A...464..377F |arxiv = astro-ph/0612449 | s2cid=14010423 }}

{{citation | postscript=. | last1=Zorec | first1=J. | last2=Royer | first2=F. | last3=Asplund | first3=Martin | last4=Cassisi | first4=Santi | last5=Ramirez | first5=Ivan | last6=Melendez | first6=Jorge | last7=Bensby | first7=Thomas | last8=Feltzing | first8=Sofia | title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities | display-authors=1 | journal=Astronomy and Astrophysics | volume=537 | pages=A120 | year=2012 | bibcode=2012A&A...537A.120Z | arxiv=1201.2052 | doi=10.1051/0004-6361/201117691 | s2cid=55586789 }}

{{citation | postscript=. | display-authors=1 | last1=Mason | first1=Brian D. | last2=Wycoff | first2=Gary L. | last3=Hartkopf | first3=William I. | last4=Douglass | first4=Geoffrey G. | last5=Worley | first5=Charles E. | title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog | journal=The Astronomical Journal | volume=122 | issue=6 | pages=3466–3471 | year=2001 | bibcode=2001AJ....122.3466M | doi=10.1086/323920| doi-access=free }}

}}

External links

[http://frostydrew.org/stars.dc/star/id-126597/pss-obsy frostydrew.org/stars.dc/star/id-126597/pss-obsy]
[http://www.wolframalpha.com/input/?i=6+Equulei www.wolframalpha.com/input/?i=6+Equulei]

Category:A-type main-sequence stars

Category:Ap stars

Category:Equuleus

Category:Durchmusterung objects