| 词条 | HD 130144 |
| 释义 |
| name=HD 130144 }}{{Starbox observe | epoch=J2000 | ra={{RA|14|46|05.94566}} | dec={{DEC|+15|07|54.4332}} | appmag_v=5.82[3] | constell=Boötes }}{{Starbox character | class=M5III[4] | r-i = | v-r = | b-v = +1.50[3] | u-b = +1.26[3] | variable=Lb[1] }}{{Starbox astrometry | radial_v={{val|-22.52|0.65}}[8] | prop_mo_ra=−85.49 | prop_mo_dec=+18.86 | parallax=4.04 | p_error=0.38 | parallax_footnote= | absmag_v= }}{{Starbox detail | mass= | radius={{val|210|21}}[4] | luminosity=5,587[13] | temperature=3,333[13] | metal_fe= | gravity= | rotational_velocity=11[4] | age_gyr= }}{{Starbox catalog | names=EK Boötis, BD+15° 2758, FK5 3168, HD 130144, HIP 72208, HR 5512, SAO 101200. }}{{Starbox reference | Simbad=HD+130144 }}{{Starbox end}}HD 130144 (or EK Boötis) is a semiregular variable star in the northern constellation of Boötes. The variation in luminosity has an amplitude of 0.38 in magnitude with no apparent periodicity. This is an X-ray source, and was possibly the first M-type giant star to have a magnetic field directly detected. It is considered to be a single star,[4] although there is nearby companion at an angular separation of 0.2023″ along a position angle of 82.2° (as of 2010.4812).[17] References1. ^{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S|volume=1|display-authors=etal|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}} [2][3][4][5][6]2. ^1 {{citation | displayauthors=1 | last1=Famaey | first1=B. | last2=Pourbaix | first2=D. | last3=Frankowski | first3=A. | last4=Van Eck | first4=S. | last5=Mayor | first5=M. | last6=Udry | first6=S. | last7=Jorissen | first7=H. A. | title=Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations | journal=Astronomy and Astrophysics | volume=498 | issue=2 | pages=627–640 | year=2009 | arxiv=0901.0934 | bibcode=2009A&A...498..627F | doi=10.1051/0004-6361/200810698}} 3. ^1 2 3 {{citation | last1=Mermilliod | first1=J.-C. | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) | journal=Catalogue of Eggen's UBV data. SIMBAD | date=1986 | bibcode=1986EgUBV........0M}} 4. ^1 2 {{cite journal | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A | last3=Boyer | first3=M. L. | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=1 | pages=343–57 | date=2012 | bibcode=2012MNRAS.427..343M | arxiv = 1208.2037 | doi = 10.1111/j.1365-2966.2012.21873.x}} 5. ^1 {{citation | display-authors=1 | last1=Horch, Elliott P. | last2=Gomez, Shamilia C. | last3=Sherry, William H. | last4=Howell, Steve B. | last5=Ciardi, David R. | last6=Anderson, Lisa M. | last7=van Altena, William F. | title=Observations of Binary Stars with the Differential Speckle Survey Instrument. II. Hipparcos Stars Observed in 2010 January and June | journal=The Astronomical Journal | volume=141 | issue=2 | id=45 | pages=13 | date=February 2011 | doi=10.1088/0004-6256/141/2/45 | bibcode=2011AJ....141...45H| url=http://authors.library.caltech.edu/22553/1/Horch2011p12763Astron_J.pdf }} 6. ^1 2 3 4 {{citation | last1=Konstantinova-Antova | first1=R. | last2=Aurière | first2=M. | last3=Charbonnel | first3=C. | last4=Drake | first4=N. A. | last5=Schröder | first5=K.-P. | last6=Stateva | first6=I. | last7=Alecian | first7=E. | last8=Petit | first8=P. | last9=Cabanac | first9=R. | title=Direct detection of a magnetic field in the photosphere of the single M giant EK Bootis. How common is magnetic activity among M giants? | journal=Astronomy and Astrophysics | volume=524 | id=A57 | pages=9 | date=December 2010 | doi=10.1051/0004-6361/201014503 | bibcode=2010A&A...524A..57K|arxiv = 1009.2001 }} }} External links
8 : Boötes|Slow irregular variables|Henry Draper Catalogue objects|Hipparcos objects|M-type giants|HR objects|Objects with variable star designations|Durchmusterung objects |
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