| 词条 | Delta Sagittae |
| 释义 |
| name = Delta Sagittae }}{{Starbox image | image = | caption=Location of δ Sagittae (circled) }}{{Starbox observe | epoch=J2000 | constell=Sagitta | ra={{RA|19|47|23.26253}}[1] | dec={{DEC|+18|32|03.4401}}[1] | appmag_v=+3.82[2] (3.91[3] / 6.64)[5] }}{{Starbox character | class=M2II + B9.5V[5] | b-v = +1.40[4] | u-b = +0.98[4] }}{{Starbox astrometry | radial_v = 2.5 ± 0.9[5] | prop_mo_ra = -4.31[1] | prop_mo_dec = 12.35[1] | parallax=5.49 | p_error=0.72 | parallax_footnote=[1] | absmag_v=−2.58[6] }}{{Starbox orbit |reference=[7] |period=10.11 |axis=0.051 |eccentricity=0.44 |periarg=257.7 |periastron=1979.93 |inclination=140.0 |node=170.2 }}{{Starbox detail |component1=δ Sge A |radius={{val|129|+13|-12}}[8] |mass={{val|3.35|+0.335|-0.30}}[8] |gravity=0.74 ± 0.10[8] |temperature={{val|3600|+288|-267}}[8] |luminosity=2500[8] |component2=δ Sge B |radius2=2.6[7] |mass2=2.9[7] |temperature2=10000[7] |luminosity2=63[7] }}{{Starbox catalog | names=δ Sagittae, 7 Sagittae, BD+18 4240, CCDM J19474+1832AB, FK5 743, GC 27391, HD 187076, HIP 97365, HR 7536, IDS 19429+1817 AB, PPM 136976, SAO 105259, WDS J19474+1832AB }}{{Starbox reference |Simbad=del+Sge }}{{Starbox end}}Delta Sagittae (Delta Sge, δ Sagittae, δ Sge) is a binary star in the constellation of Sagitta, with an apparent magnitude of +3.68. The primary component is a red M-type bright giant, and the secondary is a B-type main-sequence star.[2] It is approximately 590 light years from Earth, based on its parallax.[1] Delta Sagittae is a spectroscopic binary with a composite spectrum, meaning that light from both stars can be detected. It has an orbital period of about 10 years and an eccentricity of about 0.44.[7] Delta Sagittae is moving through the Galaxy at a speed of 9.8 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,800 and 35,300 light years from the center of the Galaxy.[9]{{Better source|reason=This source is inaccessible.|date=July 2017}} NamingIn Chinese, {{lang|zh|左旗}} ({{lang|zh-Latn|Zuǒ Qí}}), meaning Left Flag, refers to an asterism consisting of δ Sagittae, α Sagittae, β Sagittae, ζ Sagittae, γ Sagittae, 13 Sagittae, 11 Sagittae, 14 Sagittae and ρ Aquilae. Consequently, δ Sagittae itself is known as {{lang|zh|左旗三}} ({{lang|zh-Latn|Zuǒ Qí sān}}, {{lang-en|the Third Star of Left Flag}}.)[10] References1. ^1 2 3 4 5 {{cite journal|title=Validation of the new Hipparcos reduction|url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL|author1=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357}} {{-}}{{Stars of Sagitta}}{{giant-star-stub}}{{multi-star-stub}}2. ^1 {{cite simbad|title=* del Sge|access-date=23 February 2017}} 3. ^Calculated from subtracting magnitudes. 4. ^1 {{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1|date=1986|bibcode= 1986EgUBV........0M }} 5. ^{{cite journal|title=General catalogue of stellar radial velocities|author=Wilson, Ralph Elmer|date=1953|bibcode=1953GCRV..C......0W}} 6. ^{{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }} 7. ^1 2 3 4 5 6 7 {{cite journal|title=Winds and accretion in delta Sagittae|author=Eaton, Joel A.|author2=Hartkopf, William I.|author3=McAlister, Harold A.|author4=Mason, Brian D.|journal=Astronomical Journal|volume=109|number=4|pages=1856–1866|date=1995|bibcode=1995AJ....109.1856E|doi=10.1086/117412}} 8. ^1 2 3 4 {{cite journal|title=A critical test of empirical mass loss formulas applied to individual giants and supergiants|author1=Schröder, K.-P.|author2=Cuntz, M.|journal=Astronomy and Astrophysics|volume=465|issue=2|pages=593–601|date=2007|bibcode=2007A&A...465..593S|doi=10.1051/0004-6361:20066633|arxiv=astro-ph/0702172}} 9. ^Delta Sagittae (HIP 97365) 10. ^{{zh icon}} AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 3 日 9 : Bayer objects|Sagitta (constellation)|M-type bright giants|Flamsteed objects|Hipparcos objects|HR objects|Henry Draper Catalogue objects|Durchmusterung objects|Spectroscopic binaries |
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