R85

{{Short description|Candidate luminous variable star in the constellation Dorado}}

{{Starbox begin

| name = R85

}}

{{Starbox image

| image = 280px

| caption = The nebula N119; R85 is the brightest of the small triangle of stars in the lower right "arm".

| credit=ESO

}}

{{Starbox observe

| credit = ESO

| epoch = J2000

| ra = {{RA|05|17|56.076}}

| dec = {{DEC|-69|16|03.77}}

| constell = Dorado

| appmag_v = 10.84 {{nowrap|(10.65 - 10.80)}}

}}

{{Starbox character

| class = B5 Iae

| type = LBV

| b-v = +0.09

| u-b = −0.65

| appmag_1_passband = U

| appmag_1 = 10.28

| appmag_2_passband = B

| appmag_2 = 10.93

| appmag_3_passband = V

| appmag_3 = 10.84

| appmag_4_passband = R

| appmag_4 = 10.53

| appmag_5_passband = I

| appmag_5 = 10.44

| appmag_6_passband = J

| appmag_6 = 10.103

| appmag_7_passband = H

| appmag_7 = 9.980

| appmag_8_passband = K

| appmag_8 = 9.822

| variable = LBV

}}

{{Starbox astrometry

| radial_v = 292

| prop_mo_ra = −1.0

| prop_mo_dec = −2.3

| parallax =

| p_error =

| dist_ly = 160,000

| dist_pc = 50,000

| absmag_v = −8.2{{snd}}−8.5

}}

{{Starbox detail

| component1 = 1960 (minimum)

| mass =

| radius = 135

| luminosity = 350,000

| temperature = 13,500

| metal_fe =

| rotational_velocity =

| rotation =

| component2 = 1983 - 1990 (maximum)

| luminosity2 = 315,000

| temperature2 = 10,000

| age_myr2 =

}}

{{Starbox catalog

| names = HD 269321, CPD−69°352, 2MASS J05175607-6916037, GSC 09162-00359, Sk−69°92

}}

{{Starbox reference

| Simbad = RMC+85

}}

R85 (or RMC 85, after the Radcliffe Observatory Magellanic Clouds catalog) is a candidate luminous blue variable located in the LH-41 OB association in the Large Magellanic Cloud.

File:R85LightCurve.png light curve for R85, plotted from ASAS-SN data]]

R85 has been shown to vary erratically in brightness with an amplitude of about 0.3 magnitudes. It shows variations on several timescales, sometimes with a distinct 400 day period. It has also shown temperature changes associated with brightness changes over several years, a characteristic of luminous blue variables.

Based on R85's current properties and evolutionary models, it probably started out with an initial mass of {{solar mass|28|link=y}}. It is theorized to be making a bubble known as DEM L132a with its stellar wind in the nebula LHA-120 N119, along with S Doradus. It has an infrared excess consistent with a stellar wind contribution.

References

{{reflist|refs =

{{cite web |url=https://asas-sn.osu.edu/variables/lookup |website=ASAS-SN Variable Stars Database|title=ASAS-SN Variable Stars Database|publisher=ASAS-SN |access-date=6 January 2022}}

{{cite journal|bibcode=2018RNAAS...2..121R|title=The 2018 Census of Luminous Blue Variables in the Local Group|journal=Research Notes of the American Astronomical Society|volume=2|issue=3|pages=121|last1=Richardson|first1=Noel D.|last2=Mehner|first2=Andrea|year=2018|arxiv=1807.04262|doi=10.3847/2515-5172/aad1f3|s2cid=119509358 |doi-access=free }}

{{cite journal|bibcode=1998A&A...337..393V|title=Light variations of massive stars (alpha Cyg variables). XVI. The LMC supergiants R 85 (LBV) and R 110 (LBV) and the SMC supergiants R 42 and R 45|journal=Astronomy and Astrophysics|volume=337|pages=393|last1=Van Genderen|first1=A. M.|last2=Sterken|first2=C.|last3=De Groot|first3=M.|year=1998}}

{{cite journal|doi=10.1088/0004-6256/138/4/1003|title=Spitzersage Infrared Photometry of Massive Stars in the Large Magellanic Cloud|journal=The Astronomical Journal|volume=138|issue=4|pages=1003–1021|year=2009|last1=Bonanos|first1=A. Z.|last2=Massa|first2=D. L.|last3=Sewilo|first3=M.|last4=Lennon|first4=D. J.|last5=Panagia|first5=N.|last6=Smith|first6=L. J.|last7=Meixner|first7=M.|last8=Babler|first8=B. L.|last9=Bracker|first9=S.|last10=Meade|first10=M. R.|last11=Gordon|first11=K. D.|last12=Hora|first12=J. L.|last13=Indebetouw|first13=R.|last14=Whitney|first14=B. A.|arxiv = 0905.1328 |bibcode = 2009AJ....138.1003B |s2cid=14056495}}

{{cite journal|bibcode=1960MNRAS.121..337F|title=The brightest stars in the Magellanic Clouds|journal=Monthly Notices of the Royal Astronomical Society|volume=121|issue=4|pages=337|last1=Feast|first1=M. W.|last2=Thackeray|first2=A. D.|last3=Wesselink|first3=A. J.|year=1960|doi=10.1093/mnras/121.4.337|doi-access=free}}

{{cite journal|bibcode=2015MNRAS.447..598S|arxiv=1406.7431|title=Luminous blue variables are antisocial: Their isolation implies that they are kicked mass gainers in binary evolution|journal=Monthly Notices of the Royal Astronomical Society|volume=447|pages=598–617|last1=Smith|first1=Nathan|last2=Tombleson|first2=Ryan|issue=1|year=2015|doi=10.1093/mnras/stu2430|doi-access=free |s2cid=119284620}}

{{cite journal|bibcode=2008RMxAA..44..355A|title=Kinematic field of the S-shaped nebula N119 in the LMC|journal=Revista Mexicana de Astronomía y Astrofísica |volume=44|pages=355|last1=Ambrocio-Cruz|first1=P.|last2=Rosado|first2=M.|author2-link=Margarita Rosado|last3=Laval|first3=A.|last4=Le Coarer|first4=E.|last5=Russeil|first5=D.|last6=Amram|first6=P.|year=2008}}

{{cite journal|bibcode=1984A&A...140..459S|title=Variable blue supergiants in the Large Magellanic Cloud - R 84, R 85, and R 99|journal=Astronomy and Astrophysics|volume=140|pages=459|last1=Stahl|first1=O.|last2=Wolf|first2=B.|last3=Leitherer|first3=C.|last4=Zickgraf|first4=F.-J.|last5=Krautter|first5=J.|last6=De Groot|first6=M.|year=1984}}

{{cite journal|bibcode=2000A&A...355L..27H|title=The Tycho-2 catalogue of the 2.5 million brightest stars|journal=Astronomy and Astrophysics|volume=355|pages=L27|last1=Høg|first1=E.|last2=Fabricius|first2=C.|last3=Makarov|first3=V. V.|last4=Urban|first4=S.|last5=Corbin|first5=T.|last6=Wycoff|first6=G.|last7=Bastian|first7=U.|last8=Schwekendiek|first8=P.|last9=Wicenec|first9=A.|year=2000}}

{{cite journal |bibcode=2003yCat.2246....0C |title=VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) |journal=CDS/ADC Collection of Electronic Catalogues |pages=II/246 |volume=2246 |last1=Cutri |first1=Roc M. |last2=Skrutskie |first2=Michael F. |last3=Van Dyk |first3=Schuyler D. |last4=Beichman |first4=Charles A. |last5=Carpenter |first5=John M. |last6=Chester |first6=Thomas |last7=Cambresy |first7=Laurent |last8=Evans |first8=Tracey E. |last9=Fowler |first9=John W. |last10=Gizis |first10=John E. |last11=Howard |first11=Elizabeth V. |last12=Huchra |first12=John P. |last13=Jarrett |first13=Thomas H. |last14=Kopan |first14=Eugene L. |last15=Kirkpatrick |first15=J. Davy |last16=Light |first16=Robert M. |last17=Marsh |first17=Kenneth A. |last18=McCallon |first18=Howard L. |last19=Schneider |first19=Stephen E. |last20=Stiening |first20=Rae |last21=Sykes |first21=Matthew J. |last22=Weinberg |first22=Martin D. |last23=Wheaton |first23=William A. |last24=Wheelock |first24=Sherry L. |last25=Zacarias |first25=N. |year=2003 |url=http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246 }}

{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|last1=Ducati|first1=J. R.|year=2002}}

{{cite journal|bibcode=2015AJ....149...26A|title=The Multiplicity of Massive Stars: A High Angular Resolution Survey with the Guidance Sensor|journal=The Astronomical Journal|volume=149|pages=26|last1=Aldoretta|first1=E. J.|last2=Caballero-Nieves|first2=S. M.|last3=Gies|first3=D. R.|last4=Nelan|first4=E. P.|last5=Wallace|first5=D. J.|last6=Hartkopf|first6=W. I.|last7=Henry|first7=T. J.|last8=Jao|first8=W.-C.|last9=Maíz Apellániz|first9=J.|last10=Mason|first10=B. D.|last11=Moffat|first11=A. F. J.|last12=Norris|first12=R. P.|last13=Richardson|first13=N. D.|last14=Williams|first14=S. J.|issue=1|year=2015|doi=10.1088/0004-6256/149/1/26|arxiv = 1410.0021 |s2cid=58911264}}<

{{cite journal|bibcode=2001A&A...366..508V|title=S Doradus variables in the Galaxy and the Magellanic Clouds|journal=Astronomy and Astrophysics|volume=366|issue=2|pages=508–531|last1=Van Genderen|first1=A. M.|year=2001|doi=10.1051/0004-6361:20000022|citeseerx=10.1.1.459.5400|s2cid=55796300 }}

}}

Category:Stars in the Large Magellanic Cloud

Category:Large Magellanic Cloud

Category:Luminous blue variables

Category:Extragalactic stars