| 词条 | Alpha Octantis |
| 释义 |
| name = α Octantis}}{{Starbox observe | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Octans | ra = {{RA|21|04|43.0645}}[1] | dec = {{DEC|−77|01|25.562}}[1] | appmag_v=5.15[1] }}{{Starbox character | class = F4III + F5III (spectroscopic binary)[2] | u-b = +0.13[3] | b-v = +0.49[3] | variable = EB[4] }}{{Starbox astrometry | radial_v = 45.0 ± 2[1] | prop_mo_ra = 13.83[1] | prop_mo_dec = −369.37[1] | parallax = 22.07 | p_error = 0.57 | parallax_footnote = [1] | absmag_v= 1.93 ± 0.02[12] }}{{Starbox orbit |reference=[2] |period_unitless=9.073 d |k1=47 |k2=47 |periastron=2435302.404 |eccentricity=0.39 |periarg=276 }}{{Starbox detail |temperature=6270[5] |metal_fe=0.07[5] |age_gyr=1.5 ± 0.1[5] }}{{Starbox catalog | names=α Oct, CD−77 1053, CPD−77 1474, FK5 787, GC 29343, HD 199532, HIP 104043, HR 8021, LTT 8327, NLTT 50332, PPM 374864, SAO 257879.[1]}}{{Starbox reference | Simbad=alf+Oct}}{{Starbox end}}Alpha Octantis (Alpha Oct, α Octantis, α Oct) is a star in the constellation of Octans. Despite being labeled the "alpha" star by Johann Bayer in his star atlas Uranometria, it is not the brightest star in the constellation – that title belongs to Nu Octantis. It has an overall apparent visual magnitude of approximately 5.15 and is a spectroscopic binary star which consists of two giant stars, each with spectral type F, orbiting each other with a period of just over 9 days.[1][2] The pair has also been classified as a Beta Lyrae-type eclipsing binary system.[4] It is a bright X-ray source with a luminosity of {{Val|22.78e29|u=ergs s−1}}. References1. ^1 2 3 4 5 6 7 8 {{cite simbad|title=* alf Oct|accessdate=September 4, 2008}} 2. ^1 2 The double-lined binary alpha Octantis, William Buscombe and Pamela M. Morris, The Observatory 80 (February 1960), pp. 28–29, {{Bibcode|1960Obs....80...28B}}. 3. ^1 HR 8021, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 4, 2008. 4. ^1 alf Oct, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 4, 2008. 5. ^1 2 3 {{cite journal|title=The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs|author1=Nordström, B.|display-authors=etal|journal=Astronomy and Astrophysics|volume=418|pages=989–1019|date=2004|bibcode=2004A&A...418..989N|doi=10.1051/0004-6361:20035959|arxiv=astro-ph/0405198}} }} External links
9 : Octans|F-type giants|Spectroscopic binaries|Beta Lyrae variables|Bayer objects|Henry Draper Catalogue objects|Hipparcos objects|Durchmusterung objects|HR objects |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。