| 词条 | 44 Andromedae |
| 释义 |
| name = 44 Andromedae}}{{Starbox observe | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Andromeda | ra = {{RA|01|10|18.74100}}[1] | dec = {{DEC|+42|04|53.3066}}[1] | appmag_v= 5.67[2] }}{{Starbox character | class = F8 V[4] | b-v = +0.59[2] | u-b = +0.12[2] }}{{Starbox astrometry | radial_v = {{Val|−14.2|0.2}}[3] | prop_mo_ra = −135.14[1] | prop_mo_dec = −42.25[1] | parallax = 19.13 | p_error = 0.28 | parallax_footnote = [1] | absmag_v = +2.07[4] }}{{Starbox detail | source = [5] | mass = 1.64 | luminosity = 12.9 | rotational_velocity = {{Val|11.6|0.8}} | rotation = 15.2 d | radius = {{Val|3.58|0.19}} | temperature = {{Val|6028|32|fmt=commas}} | metal_fe = {{Val|−0.01|0.04}} | gravity = {{Val|3.78|0.07}} | age_gyr = 2.59 }}{{Starbox catalog | names= {{odlist | F=44 And | BD=+41° 219 | FK5=2075 | GJ=225 | HD=6920 | HIP=5493 | HR=340 | SAO=36984 | GC=1410 | PPM=43709 }}[6] }}{{Starbox reference | Simbad=44+and }}{{Starbox end}}44 Andromedae is a single,[7] yellow-white hued star in the northern constellation of Andromeda.[6] 44 Andromedae is the Flamsteed designation. It has an apparent visual magnitude of approximately 5.67,[2] which indicates it is a dim star that is just visible to the naked eye on a dark night. The annual parallax shift as measured by the Hipparcos spacecraft is 19.13 mas,[1] which yields a distance estimate of around 170 light years. It is moving closer to the Sun with a radial velocity of −14 km/s.[3] This star has been assigned a stellar classification of F8 V,[5] which indicates it is an ordinary F-type main-sequence star. However, Gray et al. (2001) gave it a class of F9 IV, suggesting it is instead a subgiant star that is evolving away from the main sequence as the hydrogen fuel at its core becomes exhausted.[8] It is an estimated 2.6 billion years old and is rotating with a period of 15.2 days. The star has 1.64 times the mass of the Sun and 3.6 times the Sun's radius. It is radiating 13 times the Sun's luminosity from its photosphere at an effective temperature of 6,028 K.[5] It appears overluminous for a star of its type which may indicate the presence of a bright companion, but no radial velocity variation has been detected.[9] References1. ^1 2 3 4 5 {{citation | first=F. | last=van Leeuwen | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=November 2007 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | arxiv=0708.1752 | postscript=. }} {{Sky|01|10|18.7404|+|42|04|53.310|1000000}}{{Stars of Andromeda}}2. ^1 2 3 {{citation | last1=Guetter | first1=H. H. | last2=Hewitt | first2=A. V. | title=Photoelectric UBV photometry for 317 PZT and VZT stars | journal=Publications of the Astronomical Society of the Pacific | volume=96 | pages=441–443 | date=June 1984 | doi=10.1086/131362 | bibcode=1984PASP...96..441G | postscript=. }} 3. ^1 {{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=. }} 4. ^HD 6920, database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS ID V/117A. Accessed on line November 19, 2008. 5. ^1 2 3 {{citation | display-authors=1 | last1=Marsden | first1=S. C. | last2=Petit | first2=P. | last3=Jeffers | first3=S. V. | last4=Morin | first4=J. | last5=Fares | first5=R. | last6=Reiners | first6=A. | last7=do Nascimento | first7=J.-D. | last8=Aurière | first8=M. | last9=Bouvier | first9=J. | last10=Carter | first10=B. D. | last11=Catala | first11=C. | last12=Dintrans | first12=B. | last13=Donati | first13=J.-F. | last14=Gastine | first14=T. | last15=Jardine | first15=M. | last16=Konstantinova-Antova | first16=R. | last17=Lanoux | first17=J. | last18=Lignières | first18=F. | last19=Morgenthaler | first19=A. | last20=Ramìrez-Vèlez | first20=J. C. | last21=Théado | first21=S. | last22=Van Grootel | first22=V. | last23=BCool Collaboration | title=A BCool magnetic snapshot survey of solar-type stars | journal=Monthly Notices of the Royal Astronomical Society | volume=444 | issue=4 | pages=3517–3536 | date=November 2014 | doi=10.1093/mnras/stu1663 | bibcode=2014MNRAS.444.3517M | arxiv=1311.3374 | postscript=. }} 6. ^1 {{cite simbad |title=44 And |accessdate=2017-12-28}} 7. ^{{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 |date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E | postscript=. |arxiv = 0806.2878 }} 8. ^{{citation | last1=Gray | first1=R. O. | last2=Napier | first2=M. G. | last3=Winkler | first3=L. I. | title=The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars | journal=The Astronomical Journal | volume=121 | issue=4 | pages=2148–2158 | date=April 2001 | doi=10.1086/319956 | bibcode=2001AJ....121.2148G | postscript=. }} 9. ^{{citation | title=The Nature of Overluminous F Stars Observed in a Radial-Velocity Survey | last1=Griffin | first1=R. F. | last2=Suchkov | first2=A. A. | journal=The Astrophysical Journal Supplement Series | volume=147 | issue=1 | pages=103–144 | date=July 2003 | doi=10.1086/367855 | bibcode=2003ApJS..147..103G | postscript=. }} 8 : F-type main-sequence stars|Andromeda (constellation)|Durchmusterung objects|Flamsteed objects|Gliese and GJ objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |
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