| 词条 | MACHO 176.18833.411 |
| 释义 |
| name=MACHO 176.18833.411 }}{{Starbox observe |constell=Sagittarius |epoch=J2000 |ra={{RA|18|00|13.08}}[1] |dec={{DEC|-27|15|39.1}}[1] |appmag_v=17.462[1] }}{{Starbox character | variable=RR Lyrae[2] }}{{Starbox astrometry |dist_ly={{val|24000|2000}}[5] |dist_pc={{val|7300|600}}[5] }}{{Starbox detail |metal_fe=−1.62 ± 0.2[3] }}{{Starbox catalog |names=MACHO 176.18833.411, OGLE BLG-RRLYR-10353 }}{{Starbox reference |Simbad=MACHO+176.18833.411 }}{{Starbox end}}MACHO 176.18833.411 (OGLE BLG-RRLYR-10353) is an RR Lyrae variable star[2][4] located in the galactic bulge of our Milky Way Galaxy. However, it is not a galactic bulge star, it is a galactic halo star, which is on the part of its elliptical orbit that brings it within the bulge before returning to the outer parts of the galaxy, the halo. The star is currently located about {{convert|850|pc|ly|abbr=on|lk=on}} from the Galactic Center.[3] {{as of|2015}}, this star has the highest velocity of any known RR Lyrae variable located in the bulge, moving at {{convert|482|km/s|mph|abbr=on|lk=on}}, only slightly below galactic escape velocity, and 5x the average velocity of bulge stars. Its nature was discovered as part of the BRAVA-RR survey.[5] References1. ^1 2 {{cite journal|bibcode=2011AcA....61....1S|title=The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. XI. RR Lyrae Stars in the Galactic Bulge|journal=Acta Astronomica|volume=61|number=1|pages=1–21|author1=Soszyński, I.|year=2011|arxiv=1105.6126}} {{var-star-stub}}2. ^1 {{cite simbad|title=MACHO 176.18833.411|accessdate=30 January 2017}} 3. ^1 2 3 {{cite journal |title= A high-velocity bulge RR Lyrae variable on a halo-like orbit |author= Andrea Kunder |bibcode= 2015ApJ...808L..12K |arxiv= 1506.02664 |doi= 10.1088/2041-8205/808/1/L12 |journal= The Astrophysical Journal Letters |volume= 808 |id= L12 |number= 1 |date= 22 May 2015 |publicationdate= 16 July 2015 |display-authors=etal |pages=L12}} 4. ^{{cite web |url= http://www.aavso.org/vsx/index.php?view=detail.top&oid=205043&image=poss2ukstu_red |title= Details for MACHO 176.18833.411 |publisher= AAVSO |work= VSX }} 5. ^{{Cite news |url= http://www.spacedaily.com/reports/Starry_surprise_in_the_bulge_encounter_of_a_halo_passerby_999.html |title= Starry surprise in the bulge: encounter of a halo passerby |date= 27 July 2015 |publisher= Space Daily }} 2 : RR Lyrae variables|Sagittarius (constellation) |
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