“70 Pegasi”的意思、由来-开放百科全书

This is a single-lined spectroscopic binary with an orbital period of {{Convert|941|day|year|abbr=off|order=flip}} and a high eccentricity of 0.713.^[11] The visible component has a stellar classification of G8 IIIa,^[4] indicating it is an evolved G-type giant star. It is a probable red clump star, which would mean it is generating energy through helium fusion at its core.^[21] The star has 2.5 times the mass of the Sun and has expanded to more than 8 times the Sun's radius. It is radiating about 48 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,032 K.^[6]

The secondary is most likely a low mass main sequence star with no more than 0.4 times the mass of the Sun.^[11]

References

1. ^{{cite simbad | title=70 Peg | accessdate=2018-02-20 }}
2. ^¹{{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 | display-authors=1 | postscript=. | last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W. | last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey | title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity | journal=The Astronomical Journal | volume=135 | issue=1 | pages=209–231 | date=January 2008 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M }}
4. ^¹²³⁴{{citation | title=The metallicity signature of evolved stars with planets | display-authors=1 | last1=Maldonado | first1=J. | last2=Villaver | first2=E. | last3=Eiroa | first3=C. | journal=Astronomy & Astrophysics | volume=554 | id=A84 | pages=18 | date=June 2013 | doi=10.1051/0004-6361/201321082 | bibcode=2013A&A...554A..84M | arxiv=1303.3418}}
5. ^¹²{{citation | title=The Perkins catalog of revised MK types for the cooler stars | author1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C. | journal=Astrophysical Journal Supplement Series | volume=71 | pages=245 | year=1989 | postscript=. | bibcode=1989ApJS...71..245K | doi=10.1086/191373 }}
6. ^¹{{citation | title=High-resolution spectroscopic study of red clump stars in the Galaxy: iron-group elements | display-authors=1 | last1=Puzeras | first1=E. | last2=Tautvaišienė | first2=G. | last3=Cohen | first3=J. G. | last4=Gray | first4=D. F. | last5=Adelman | first5=S. J. | last6=Ilyin | first6=I. | last7=Chorniy | first7=Y. | journal=Monthly Notices of the Royal Astronomical Society | volume=408 | issue=2 | pages=1225−1232 | date=October 2010 | doi=10.1111/j.1365-2966.2010.17195.x | bibcode=2010MNRAS.408.1225P | arxiv=1006.3857}}
7. ^¹²³{{citation | title=Abundances in the Local Region. I. G and K Giants | last1=Luck | first1=R. Earle | journal=Astronomical Journal | volume=150 | issue=3 | at=88 | year=2015 | bibcode=2015AJ....150...88L | doi=10.1088/0004-6256/150/3/88 | arxiv=1507.01466 | postscript=. }}
8. ^¹²³⁴{{citation | title=Spectroscopic binary orbits from photoelectric radial velocities. Paper 207: 58 Piscium, 31 Vulpeculae, and 70 Pegasi | last1=Griffin | first1=R. F. | journal=The Observatory | volume=129 | pages=198−218 | date=August 2009 | bibcode=2009Obs...129..198G | postscript=. }}

词条	70 Pegasi
释义	References {{Starbox begin \| name = 70 Pegasi }}{{Starbox observe \| epoch= J2000.0 \| constell = Pegasus \| ra = {{RA\|23\|29\|09.29698}} \| dec = {{DEC\|+12\|45\|37.9918}} \| appmag_v = 4.56^[3] }}{{Starbox character \| class = G8 IIIa^[4] \| b-v = 0.940^[3] \| u-b = \| variable = }}{{Starbox astrometry \| radial_v = {{Val\|−16.88\|0.43}}^[6] \| prop_mo_ra = +61.40 \| prop_mo_dec = +24.82 \| parallax = 18.65 \| p_error = 0.78 \| parallax_footnote = \| absmag_v = 0.90^[10] }}{{Starbox orbit \| reference = ^[11] \| period_unitless = {{Val\|941.03\|0.12\|u=days}} \| eccentricity = {{Val\|0.713\|0.006}} \| periarg = {{Val\|57.0\|1.2}} \| k1 = {{Val\|3.16\|0.04}} }}{{Starbox detail \| source = ^[6] \| component1 = 70 Peg A \| mass = {{Val\|2.49\|0.06}} \| radius = {{Val\|8.44\|0.37}} \| luminosity = {{Val\|47.9\|4.6\|4.2}} \| temperature = {{Val\|5032\|15\|fmt=commas}} \| gravity = {{Val\|2.92\|0.05}} \| metal_fe = {{Val\|0.05\|0.03}} \| rotational_velocity = 3.6^[13] \| age_myr = {{Val\|590\|40}} }}{{Starbox catalog \| names = {{odlist \| F=70 Peg \| BD=+11° 5009 \| FK5=885 \| HD=221115 \| HIP=115919 \| HR=8923 \| SAO=108638 }}^[1] }}{{Starbox reference \| Simbad=70+Peg }}{{Starbox end}}70 Pegasi is a binary star^[11] system in the northern constellation Pegasus. It is a faint star, visible to the naked eye under good seeing conditions, with an apparent visual magnitude of 4.56.^[3] The measured annual parallax shift measured from Earth's orbit is 18.65 mas, yielding a distance estimate of around 175 light years. The visual magnitude of the star is diminished by an extinction of {{Val\|0.07\|0.02}} due to interstellar dust. It is moving closer to the Sun with a radial velocity of −17 km/s.^[6] This is a single-lined spectroscopic binary with an orbital period of {{Convert\|941\|day\|year\|abbr=off\|order=flip}} and a high eccentricity of 0.713.^[11] The visible component has a stellar classification of G8 IIIa,^[4] indicating it is an evolved G-type giant star. It is a probable red clump star, which would mean it is generating energy through helium fusion at its core.^[21] The star has 2.5 times the mass of the Sun and has expanded to more than 8 times the Sun's radius. It is radiating about 48 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,032 K.^[6] The secondary is most likely a low mass main sequence star with no more than 0.4 times the mass of the Sun.^[11] References 1. ^{{cite simbad \| title=70 Peg \| accessdate=2018-02-20 }} 2. ^¹{{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 \| display-authors=1 \| postscript=. \| last1=Massarotti \| first1=Alessandro \| last2=Latham \| first2=David W. \| last3=Stefanik \| first3=Robert P. \| last4=Fogel \| first4=Jeffrey \| title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity \| journal=The Astronomical Journal \| volume=135 \| issue=1 \| pages=209–231 \| date=January 2008 \| doi=10.1088/0004-6256/135/1/209 \| bibcode=2008AJ....135..209M }} 4. ^¹²³⁴{{citation \| title=The metallicity signature of evolved stars with planets \| display-authors=1 \| last1=Maldonado \| first1=J. \| last2=Villaver \| first2=E. \| last3=Eiroa \| first3=C. \| journal=Astronomy & Astrophysics \| volume=554 \| id=A84 \| pages=18 \| date=June 2013 \| doi=10.1051/0004-6361/201321082 \| bibcode=2013A&A...554A..84M \| arxiv=1303.3418}} 5. ^¹²{{citation \| title=The Perkins catalog of revised MK types for the cooler stars \| author1=Keenan \| first1=Philip C. \| last2=McNeil \| first2=Raymond C. \| journal=Astrophysical Journal Supplement Series \| volume=71 \| pages=245 \| year=1989 \| postscript=. \| bibcode=1989ApJS...71..245K \| doi=10.1086/191373 }} 6. ^¹{{citation \| title=High-resolution spectroscopic study of red clump stars in the Galaxy: iron-group elements \| display-authors=1 \| last1=Puzeras \| first1=E. \| last2=Tautvaišienė \| first2=G. \| last3=Cohen \| first3=J. G. \| last4=Gray \| first4=D. F. \| last5=Adelman \| first5=S. J. \| last6=Ilyin \| first6=I. \| last7=Chorniy \| first7=Y. \| journal=Monthly Notices of the Royal Astronomical Society \| volume=408 \| issue=2 \| pages=1225−1232 \| date=October 2010 \| doi=10.1111/j.1365-2966.2010.17195.x \| bibcode=2010MNRAS.408.1225P \| arxiv=1006.3857}} 7. ^¹²³{{citation \| title=Abundances in the Local Region. I. G and K Giants \| last1=Luck \| first1=R. Earle \| journal=Astronomical Journal \| volume=150 \| issue=3 \| at=88 \| year=2015 \| bibcode=2015AJ....150...88L \| doi=10.1088/0004-6256/150/3/88 \| arxiv=1507.01466 \| postscript=. }} 8. ^¹²³⁴{{citation \| title=Spectroscopic binary orbits from photoelectric radial velocities. Paper 207: 58 Piscium, 31 Vulpeculae, and 70 Pegasi \| last1=Griffin \| first1=R. F. \| journal=The Observatory \| volume=129 \| pages=198−218 \| date=August 2009 \| bibcode=2009Obs...129..198G \| postscript=. }} ^[2]^[3]^[4]^[5]^[6]^[7]^[8] }}{{Stars of Pegasus}} 9 : G-type giants\|Horizontal-branch stars\|Spectroscopic binaries\|Pegasus (constellation)\|Durchmusterung objects\|Flamsteed objects\|Henry Draper Catalogue objects\|Hipparcos objects\|HR objects
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