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V669 Cassiopeiae

{{Short description|Star in Cassiopeia}}

{{Starbox begin}}

{{Starbox observe

| epoch = J2000.0

| constell = Cassiopeia

| ra = {{RA|01|33|51.21}}

| dec = {{DEC|62|26|53.2}}

| appmag_v = 17.48

}}

{{Starbox character

| type = AGB

| class = M9III

| appmag_1_passband = J

| appmag_1 = 16.747

| appmag_2_passband = H

| appmag_2 = 11.232

| appmag_3_passband = K

| appmag_3 = 7.097

| variable = Mira?

}}

{{Starbox astrometry

| dist_pc = 2,100

}}

{{Starbox detail

| source =

| mass =

| temperature = 3,000

| luminosity = 10,000 - 36,000

| radius = {{solar radius calculator|type=LT|10000|3000}}{{snd}}{{solar radius calculator|type=LT|36000|3000}}

}}

{{Starbox reference

| Simbad = V669+Cas

}}

{{Starbox end}}

V669 Cassiopeiae or V669 Cas is an OH/IR star, a type of particularly cool red giant, with a spectral type of M9III.

With a mean visual apparent magnitude 17.5, V669 Cassiopeiae varies with an amplitude of about half a magnitude. In the mid-infrared L band, its magnitude range is 1.57 to 3.02. It is listed as a possible Mira variable, but with the extremely long period of 1,994 days.

Jan Herman and Harm Jan Habing reported in 1985 that the star's OH maser emission varied in intensity with a 1994 day period. In 1990, Paolo Persi et al. showed that V669 Cassiopeiae varied in infrared brightness, and for that reason it was given its variable star designation in 1993.

The distance and physical properties of V669 Cassiopeiae are highly uncertain. Based on parallax, it is about 1,600 light years away, but a distance of about 20,000 light years has been derived based on observations of masers around the star. Based on a luminosity derived from its pulsations and spectral energy distribution, it would be at a distance of 6,850 light years.

See also

References

{{reflist|refs=

{{cite journal |last1=Herman |first1=J. |last2=Habing |first2=H. J. |title=Time variations and shell sizes of OH masers in late-type stars |journal=Astronomy and Astrophysics, Supplement Series |date=March 1985 |volume=59 |pages=523–555 |url=https://articles.adsabs.harvard.edu/pdf/1985A%26AS...59..523H |bibcode=1985A&AS...59..523H |access-date=29 August 2024}}

{{cite journal |last1=Persi |first1=P. |last2=Ferrari-Toniolo |first2=M. |last3=Shivanandan |first3=K. |last4=Ranieri |first4=M. |last5=Marenzi |first5=A. |title=Infrared photometry up to 34 mu.m of the type II OH/IR sources OH 127.8-0.0 and OH 345.0+15.7 |journal=Astronomy and Astrophysics |date=October 1990 |volume=237 |pages=153–158 |url=https://articles.adsabs.harvard.edu/pdf/1990A%26A...237..153P |bibcode=1990A&A...237..153P |access-date=29 August 2024}}

{{cite journal |last1=Kazarovets |first1=E. V. |last2=Samus |first2=N. N. |last3=Goranskij |first3=V. P. |title=The 71st Name-List of Variable Stars |journal=Information Bulletin on Variable Stars |date=February 1993 |volume=3840 |issue=3840 |page=1 |url=https://ibvs.konkoly.hu/pub/ibvs/3801/3840.pdf |bibcode=1993IBVS.3840....1K |access-date=29 August 2024}}

{{cite journal |bibcode=2013A&A...554A.142L |title=H2O vapor excitation in dusty AGB envelopes. A PACS view of OH 127.8+0.0 |last1=Lombaert |first1=R. |last2=Decin |first2=L. |last3=De Koter |first3=A. |last4=Blommaert |first4=J. A. D. L. |last5=Royer |first5=P. |last6=De Beck |first6=E. |last7=De Vries |first7=B. L. |last8=Khouri |first8=T. |last9=Min |first9=M. |journal=Astronomy and Astrophysics |year=2013 |volume=554 |doi=10.1051/0004-6361/201218974 |arxiv=1505.07696 |s2cid=98319654 }}

{{cite journal |bibcode=2018MNRAS.477.3145J |title=The ASAS-SN catalogue of variable stars I: The Serendipitous Survey |last1=Jayasinghe |first1=T. |last2=Kochanek |first2=C. S. |last3=Stanek |first3=K. Z. |last4=Shappee |first4=B. J. |last5=Holoien |first5=T. W. -S. |last6=Thompson |first6=Todd A. |last7=Prieto |first7=J. L. |last8=Dong |first8=Subo |last9=Pawlak |first9=M. |last10=Shields |first10=J. V. |last11=Pojmanski |first11=G. |last12=Otero |first12=S. |last13=Britt |first13=C. A. |last14=Will |first14=D. |journal=Monthly Notices of the Royal Astronomical Society |year=2018 |volume=477 |issue=3 |page=3145 |doi=10.1093/mnras/sty838 |doi-access=free |arxiv=1803.01001 }}

{{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 | display-authors=1 |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 }}

{{cite journal

| display-authors=1 | last1=Samus | first1=N. N.

| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.

| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.

| title=General Catalogue of Variable Stars

| version=5.1 | journal=Astronomy Reports

| year=2017 | volume=61 | issue=1 | pages=80–88

| bibcode=2017ARep...61...80S | doi=10.1134/S1063772917010085

| s2cid=125853869 }}

{{cite journal|bibcode=2010A&A...523A..18D|arxiv=1008.1083|title=Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles. II. CO line survey of evolved stars: Derivation of mass-loss rate formulae|journal=Astronomy and Astrophysics|volume=523|pages=A18|last1=De Beck|first1=E.|last2=Decin|first2=L.|last3=De Koter|first3=A.|last4=Justtanont|first4=K.|last5=Verhoelst|first5=T.|last6=Kemper|first6=F.|last7=Menten|first7=K. M.|year=2010|doi=10.1051/0004-6361/200913771|s2cid=16131273}}

}}

{{Stars of Cassiopeia}}

Category:Cassiopeia (constellation)

Cassiopeiae, V669

Category:Mira variables

Category:M-type giants