Star in the constellation Ophiuchus
ι Ophiuchi ,Latinized asIota Ophiuchi , is a single[ 11] star in theequatorial constellation ofOphiuchus , positioned near the constellation border withHercules . It makes a naked-eye double with nearbyKappa Ophiuchi ,[ 12] apparent visual magnitude of 4.39.[ 2] [ 1] radial velocity of −19 km/s.[ 6]
This object is aB-type main-sequence star with astellar classification of B8V.[ 4] [ 9] projected rotational velocity of 124 km/s.[ 3] [ 3] mass of the Sun and around 2.8[ 7] Sun's radius . Iota Ophiuchi is radiating 141[ 3] luminosity of the Sun from itsphotosphere at aneffective temperature of 11,220 K.[ 3] infrared excess , suggesting the presence of circumstellar material.[ 13]
^a b c d e f 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 . Vizier catalog entry ^a b c 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 . Vizier catalog entry ^a b c d e f g h i Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars".Astronomy & Astrophysics .537 : A120.arXiv :1201.2052 Bibcode :2012A&A...537A.120Z .doi :10.1051/0004-6361/201117691 .S2CID 55586789 . Vizier catalog entry ^a b Cowley, A. (November 1972). "Spectral classification of the bright B8 stars".Astronomical Journal .77 :750– 755.Bibcode :1972AJ.....77..750C .doi :10.1086/111348 . ^a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars".The Journal of the American Association of Variable Star Observers .42 (2): 443.Bibcode :2014JAVSO..42..443M . Vizier catalog entry ^a b Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system".Astronomy Letters .32 (11):759– 771.arXiv :1606.08053 Bibcode :2006AstL...32..759G .doi :10.1134/S1063773706110065 .S2CID 119231169 . ^a b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures".Astronomy and Astrophysics .352 :555– 562.arXiv :astro-ph/9911002 Bibcode :1999A&A...352..555A . Vizier catalog entry ^a b Wu, Yue; et al. (2010). "Coudé-feed stellar spectral library – atmospheric parameters".Astronomy & Astrophysics .525 : A71.arXiv :1009.1491 Bibcode :2011A&A...525A..71W .doi :10.1051/0004-6361/201015014 .S2CID 53480665 . ^a b Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars".Astronomy Letters .38 (11):694– 706.arXiv :1606.09028 Bibcode :2012AstL...38..694G .doi :10.1134/S1063773712110035 .S2CID 119108982 . ^ "iot Oph" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2019-09-05 .^ Eggleton, P. P.; Tokovinin, A. A. (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 . ^ Arnold, H. J. P.; et al. (1999).The Photographic Atlas of the Stars ISBN 9780750306546 ^ McDonald, I.; et al. (2012)."Fundamental parameters and infrared excesses of Hipparcos stars" .Monthly Notices of the Royal Astronomical Society .427 (1):343– 357.arXiv :1208.2037 Bibcode :2012MNRAS.427..343M .doi :10.1111/j.1365-2966.2012.21873.x S2CID 118665352 .
