| 词条 | V4381 Sagittarii |
| 释义 |
| name = V4381 Sagittarii }}{{Starbox observe | epoch = J2000 | constell = Sagittarius | ra = {{RA|18|08|38.58558}}[1] | dec = {{DEC|-21|26|58.4136}}[1] | appmag_v = 6.538[2] {{nowrap|(6.57p - 6.62p[4])}} }}{{Starbox character | type=Supergiant[2] | class=A2 Iab[2] | b-v=+0.856[2] | u-b=+0.279[2] | variable=α Cyg[3] }}{{Starbox astrometry | prop_mo_ra=−1.65[1] | prop_mo_dec=−1.05[1] | parallax= 2.25 | p_error=0.55 | parallax_footnote=[1] | dist_ly = | dist_pc = | absmag_v=−6.6[4] | absmag_bol= | radial_v=−16[5] }}{{Starbox detail | source = | mass = 7.00[15] | radius = | gravity = 1.50[2] | luminosity = 39,000[2] | luminosity_visual = | temperature = 9,000[2] | rotational_velocity = 18[2] | age_myr = 43.3[6] }}{{Starbox catalog | names = V4381 Sagittarii, HD 165784, HIP 88876, BD−21°4866, 2MASS J18083858-2126584 }}{{Starbox reference | Simbad = V4381+Sgr }}{{Starbox end}} V4381 Sagittarii is a variable star in the constellation Sagittarius. A white supergiant of spectral type A2/A3Iab, it is an Alpha Cygni variable that varies between apparent photographic magnitudes 6.57 and 6.62. Its visual apparent magnitude is about 6.54. V4381 Sagittarii is associated with a small reflection and emission nebula, although it is not actually seen within the nebulosity. The nebula is catalogued as GN 18.05.6.[7] It was first listed as VdB 113 and described as possibly associated with a loose open cluster.[8] That name has since been used for the cluster itself, which is much more distant than the distance of V4381 Sagittarii derived from its Hipparcos parallax.[9] The whole cluster is less than a quarter of a degree across, with dozens of members from 8th magnitude downwards. V4381 Sagittarii is listed as a probable member, while the nearby bright stars HD 165516 and WR 111 are considered unlikely to be members.[10] References1. ^1 2 3 4 {{cite journal|bibcode=2007A&A...474..653V|title=Validation of the new Hipparcos reduction|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653|author1=Van Leeuwen|first1=F.|year=2007|doi=10.1051/0004-6361:20078357|arxiv = 0708.1752 }} 2. ^1 2 3 4 5 6 7 8 {{cite journal|bibcode=2012A&A...543A..80F|arxiv=1207.0308|title=Quantitative spectroscopy of Galactic BA-type supergiants. I. Atmospheric parameters|journal=Astronomy & Astrophysics|volume=543|pages=A80|author1=Firnstein|first1=M.|last2=Przybilla|first2=N.|year=2012|doi=10.1051/0004-6361/201219034}} 3. ^1 {{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S|volume=1|display-authors=etal|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}} 4. ^{{cite journal|bibcode=1978ApJS...38..309H|title=Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way|journal=Astrophysical Journal|volume=38|pages=309|author1=Humphreys|first1=R. M.|year=1978|doi=10.1086/190559}} 5. ^{{cite journal|bibcode=2006AstL...32..759G|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|journal=Astronomy Letters|volume=32|issue=11|pages=759|author1=Gontcharov|first1=G. A.|year=2006|doi=10.1134/S1063773706110065|arxiv = 1606.08053 }} 6. ^1 {{cite journal|bibcode= 2011MNRAS.410..190T|title= A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun|journal= Monthly Notices of the Royal Astronomical Society|volume= 410|pages= 190|author1= Tetzlaff|first1= N.|last2= Neuhäuser|first2= R.|last3= Hohle|first3= M. M.|year= 2011|doi= 10.1111/j.1365-2966.2010.17434.x|arxiv = 1007.4883 }} 7. ^{{cite journal|bibcode=2003A&A...399..141M|title=Merged catalogue of reflection nebulae|journal=Astronomy and Astrophysics|volume=399|pages=141|author1=Magakian|first1=T. Yu.|year=2003|doi=10.1051/0004-6361:20021743}} 8. ^{{cite journal|bibcode=1966AJ.....71..990V|title=A study of reflection nebulae|journal=Astronomical Journal|volume=71|pages=990|author1=Van Den Bergh|first1=S.|year=1966|doi=10.1086/109995}} 9. ^{{cite journal|bibcode=2008A&A...477..165P|title=Tidal radii and masses of open clusters|journal=Astronomy and Astrophysics|volume=477|pages=165|author1=Piskunov|first1=A. E.|last2=Schilbach|first2=E.|last3=Kharchenko|first3=N. V.|last4=Röser|first4=S.|last5=Scholz|first5=R.-D.|year=2008|doi=10.1051/0004-6361:20078525}} 10. ^{{cite journal|bibcode=2013A&A...558A..53K|title=Global survey of star clusters in the Milky Way. II. The catalogue of basic parameters|journal=Astronomy & Astrophysics|volume=558|pages=A53|author1=Kharchenko|first1=N. V.|last2=Piskunov|first2=A. E.|last3=Schilbach|first3=E.|last4=Röser|first4=S.|last5=Scholz|first5=R.-D.|year=2013|doi=10.1051/0004-6361/201322302|arxiv = 1308.5822 }} External links
9 : Sagittarius (constellation)|Alpha Cygni variables|A-type supergiants|Objects with variable star designations|Henry Draper Catalogue objects|Hipparcos objects|Durchmusterung objects|2MASS objects|Gould objects |
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