“HR 7578”的意思、由来-开放百科全书

The two stars of HR 7578 are fairly old, older than the Pleiades but possibly younger than the Hyades.^[8] The stars are between {{val|5e8}} and {{val|2e9}} years old.^[8] Both are K-type main-sequence stars.^[4] Both stars have a minimum mass of {{solar mass|0.85 ± 0.03}}, and are unusually metal-rich, showing high amounts of cyanide and sodium in their spectra.^[8]

HR 7578 is a BY Draconis variable. This is a class of variable star whose variability comes from starspots on the stars' surfaces. HR 7578 also has a common proper motion companion, 2MASS J19542064−2356398. It is a red dwarf that is at least 580 astronomical units from the central star system.

References

1. ^¹²{{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|date=1986|bibcode= 1986EgUBV........0M}}
2. ^¹²³⁴{{cite journal|bibcode=1983ApJ...267..682F|doi=10.1086/160905|title=HR 7578 - A K dwarf double-lined spectroscopic binary with peculiar abundances|journal=The Astrophysical Journal|volume=267|pages=682|year=1983|last1=Fekel|first1=F. C., Jr.|last2=Beavers|first2=W. I.}}
3. ^¹{{cite journal | title=New Precision Orbits of Bright Double-lined Spectroscopic Binaries. X. HD 96511, HR 7578, and KZ Andromedae | last1=Fekel | first1=Francis C. | last2=Henry | first2=Gregory W. | last3=Tomkin | first3=Jocelyn | journal=The Astronomical Journal | volume=154 | issue=3 | at=120 | year=2017 | bibcode=2017AJ....154..120F | doi=10.3847/1538-3881/aa816e }}
4. ^¹²³⁴⁵⁶{{cite DR2|6863535898551993472}}
5. ^¹²³{{cite journal|doi=10.1051/0004-6361/201424882|arxiv=1412.7075|bibcode=2015A&A...574A..76P|title=Tachoastrometry: Astrometry with radial velocities|journal=Astronomy & Astrophysics|volume=574|pages=A76|year=2015|last1=Pasquini|first1=L.|last2=Cortés|first2=C.|last3=Lombardi|first3=M.|last4=Monaco|first4=L.|last5=Leão|first5=I. C.|last6=Delabre|first6=B.}}

词条	HR 7578
释义	References {{Starbox begin}}{{Starbox observe \| epoch = J2000 \| constell = Sagittarius \| ra = {{RA\|19\|54\|17.17.7453}}^[1] \| dec = {{DEC\|−23\|56\|27.8630}}^[1] \| appmag_v = 6.18 }}{{Starbox character \|class=K3 V + K3 V^[4] \|b-v=+1.045^[5] \|u-b=+0.915^[5] \|variable=BY Dra }}{{Starbox astrometry \| radial_v = −5.1 ± 0.2^[8] \| prop_mo_ra = {{val\|−124.476\|0.067}}^[1] \| prop_mo_dec = {{val\|−410.440\|0.043}}^[1] \| parallax = 70.8873 \| p_error = 0.0399 \| parallax_footnote = ^[1] \| absmag_v = }}{{Starbox orbit \| reference = ^[12] \| primary = HR 7578A \| name = HR 7578B \| period_unitless = {{val\|46.816103\|0.000057\|u=days}} \| axis = \| inclination = \| periastron = {{val\|2455441.0477\|0.0030\|u=HJD}} \| eccentricity = {{val\|0.68640\|0.00028}} \| periarg = {{val\|241.168\|0.046}} \| k1 = {{val\|47.84\|0.033}} \| k2 = {{val\|48.686\|0.031}} }}{{Starbox detail \|rotational_velocity=2.0^[4] }}{{Starbox catalog \|names={{odlist\|CD=-24° 15668\|GJ=770\|HD=188088\|HIP=97944\|HR=7578\|SAO=188692}} }}{{Starbox reference \|Simbad=HR+7578 \|ARICNS=01605 }}{{Starbox end}}HR 7578 (also known as V4200 Sagittarii) is a binary star in the constellation of Sagittarius. Their combined apparent magnitude is 6.18. Parallax measurements by the Gaia spacecraft put the system at 46.01 light-years (14.107 parsecs) away, making this a nearby system.^[1] The two stars of HR 7578 are fairly old, older than the Pleiades but possibly younger than the Hyades.^[8] The stars are between {{val\|5e8}} and {{val\|2e9}} years old.^[8] Both are K-type main-sequence stars.^[4] Both stars have a minimum mass of {{solar mass\|0.85 ± 0.03}}, and are unusually metal-rich, showing high amounts of cyanide and sodium in their spectra.^[8] HR 7578 is a BY Draconis variable. This is a class of variable star whose variability comes from starspots on the stars' surfaces. HR 7578 also has a common proper motion companion, 2MASS J19542064−2356398. It is a red dwarf that is at least 580 astronomical units from the central star system. References 1. ^¹²{{cite journal\|author1=Mermilliod, J.-C.\|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)\|journal=Catalogue of Eggen's UBV Data\|date=1986\|bibcode= 1986EgUBV........0M}} 2. ^¹²³⁴{{cite journal\|bibcode=1983ApJ...267..682F\|doi=10.1086/160905\|title=HR 7578 - A K dwarf double-lined spectroscopic binary with peculiar abundances\|journal=The Astrophysical Journal\|volume=267\|pages=682\|year=1983\|last1=Fekel\|first1=F. C., Jr.\|last2=Beavers\|first2=W. I.}} 3. ^¹{{cite journal \| title=New Precision Orbits of Bright Double-lined Spectroscopic Binaries. X. HD 96511, HR 7578, and KZ Andromedae \| last1=Fekel \| first1=Francis C. \| last2=Henry \| first2=Gregory W. \| last3=Tomkin \| first3=Jocelyn \| journal=The Astronomical Journal \| volume=154 \| issue=3 \| at=120 \| year=2017 \| bibcode=2017AJ....154..120F \| doi=10.3847/1538-3881/aa816e }} 4. ^¹²³⁴⁵⁶{{cite DR2\|6863535898551993472}} 5. ^¹²³{{cite journal\|doi=10.1051/0004-6361/201424882\|arxiv=1412.7075\|bibcode=2015A&A...574A..76P\|title=Tachoastrometry: Astrometry with radial velocities\|journal=Astronomy & Astrophysics\|volume=574\|pages=A76\|year=2015\|last1=Pasquini\|first1=L.\|last2=Cortés\|first2=C.\|last3=Lombardi\|first3=M.\|last4=Monaco\|first4=L.\|last5=Leão\|first5=I. C.\|last6=Delabre\|first6=B.}} ^[1]^[2]^[3]^[4]^[5] }}{{Stars of Sagittarius}} 10 : BY Draconis variables\|K-type main-sequence stars\|Spectroscopic binaries\|Sagittarius (constellation)\|Durchmusterung objects\|Gliese and GJ objects\|Henry Draper Catalogue objects\|Hipparcos objects\|HR objects\|Objects with variable star designations
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