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词条 HD 74772
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  1. References

{{about-distinguish|d Velorum|delta Velorum{{!}}δ Velorum}}{{Starbox begin
| name = HD 74772
}}{{Starbox observe
| epoch = J2000
| constell = Vela
| ra = {{RA|08|44|23.94539}}[1]
| dec = {{DEC|−42|38|57.3933}}[1]
| appmag_v = 4.05[3]
}}{{Starbox character
| class = G6 III[4]
| b-v = {{Val|0.874|0.002}}[3]
}}{{Starbox astrometry
| radial_v = {{Val|−2.0|0.3}}[6]
| prop_mo_ra = −22.641[1]
| prop_mo_dec = +19.137[1]
| parallax = 15.7791
| p_error = 0.3148
| parallax_footnote = [1]
| absmag_v = −0.18[3]
}}{{Starbox detail
| source =
| mass = 3.2[11]
| radius = 12[12]
| luminosity = 128.02[3]
| gravity = 2.50[14]
| temperature = 5,210[14]
| metal_fe = −0.03[14]
| rotational_velocity = 5.8[17]
| age_myr =
}}{{Starbox catalog
| names={{odlist | B=d Vel | CD=−42° 4569 | GJ=9276 | HD=74772 | HIP=42884 | HR=3477 | SAO=220371 | WDS=J08444-4239A }}
}}{{Starbox reference
| Simbad = HD+74772
}}{{Starbox end}}HD 74772 (d Velorum) is a single[19] star in the southern constellation of Vela. It is positioned near the Vela SNR, which gives it an intense X-ray background.[20] The star is of apparent visual magnitude 4.05,[3] and hence is visible to the naked eye. Based upon an annual parallax shift of {{Val|15.8|ul=mas}},[1] it is located 207 light years from the Sun. It is moving closer to the Earth with a heliocentric radial velocity of −2 km/s.[6]

This is an evolved G-type giant star with a stellar classification of G6 III.[4] The interferometry-measured angular diameter of this star is {{Val|1.73|0.12|u=mas}},[25] which, at its estimated distance, equates to a physical radius of about 12 times the radius of the Sun.[12] It has 3.2[11] times the mass of the Sun and is radiating 128[3] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,210 K.[14]

References

1. ^1 2 3 4 5 6 {{cite DR2}}
2. ^1 2 3 4 5 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=. }}
3. ^1 {{citation | title=A catalogue of multiplicity among bright stellar systems | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869 | date=2008 | doi=10.1111/j.1365-2966.2008.13596.x | arxiv=0806.2878 | bibcode=2008MNRAS.389..869E | postscript=. }}
4. ^1 2 3 4 {{citation | display-authors=1 | postscript=. | last1=Jones | first1=K. L. | last2=Robinson | first2=R. D. | last3=Slee | first3=O. B. | last4=Stewart | first4=R. T. | title=Spectroscopic investigation of cool giants and the authenticity of their reported microwave emission | journal=Monthly Notices of the Royal Astronomical Society | volume=256 | issue=3 | pages=535–544 | date=June 1992 | bibcode=1992MNRAS.256..535J | doi=10.1093/mnras/256.3.535 }}
5. ^1 {{citation | title=On the link between rotation and coronal activity in evolved stars | last1=de Medeiros | first1=J. R. | last2=Mayor | first2=M. | journal=Astronomy and Astrophysics | volume=302 | page=745 | date=October 1995 | bibcode=1995A&A...302..745D | postscript=. }}
6. ^1 2 {{citation | last1=Gondoin | first1=P. | title=Evolution of X-ray activity and rotation on G-K giants | journal=Astronomy and Astrophysics | volume=352 | pages=217–227 | date=December 1999 | bibcode=1999A&A...352..217G | postscript=. }}
7. ^1 {{citation | display-authors=1 | last1=Richichi | first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | postscript=. | volume=431 | issue=2 | pages=773–777 | date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}
8. ^1 2 {{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3rd | publisher=Birkhäuser | date=2006 | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41}}. The radius (R*) is given by::
9. ^1 2 {{citation | last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | postscript=. }}
10. ^1 {{citation | contribution=Soft X-ray Emission and Spectra of Evolved Stars from ROSAT Pointed Observations | display-authors=1 | last1=Maggio | first1=A. | last2=Sciortino | first2=S. | last3=Harden | first3=F. R., Jr. | title=Physics of Solar and Stellar Coronae: G. S. Vaiana Memorial Symposium, held 22-26 June, 1992, in Palermo, Italy | editor1-first=Jeffrey L. | editor1-last=Linsky | editor2-first=Salvatore | editor2-last=Serio | series=Astrophysics and Space Science Library | volume=183 | publisher=Kluwer Academoc Publishers | publication-place=P. O. Box 17, 3300 AA Dordrecht, The Netherlands | year=1993 | page=365 | doi=10.1007/978-94-011-1964-1_47 | bibcode=1993ASSL..183..365M | postscript=. }}
11. ^1 2 {{citation | title=The Perkins catalog of revised MK types for the cooler stars | journal=Astrophysical Journal Supplement Series | last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C. | volume=71 | pages=245 | year=1989 | postscript=. | bibcode=1989ApJS...71..245K | doi=10.1086/191373 }}
[1][2][3][4][5][6][7][8][9][10][11]
}}{{Stars of Vela}}

7 : G-type giants|Vela (constellation)|Bayer objects|Durchmusterung objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects
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