R Puppis

{{Starbox image

|image=

{{Location mark

|image=Puppis constellation map.svg|alt=|float=center|width=240

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=R Puppis

|x=468|y=688

}}

|caption=Location of R Puppis (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Puppis

| ra = {{RA|07|40|52.597}}

| dec = {{DEC|-31|39|40.20}}

| appmag_v = 6.50 - 6.71

}}

{{Starbox character

| class = G2 0-Ia

| b-v = +1.18

| u-b = +0.85

| variable = SRd

}}

{{Starbox astrometry

| radial_v = +68.22

| prop_mo_ra = −2.251

| prop_mo_dec = +3.222

| parallax = 0.2440

| p_error = 0.0180

| parallax_footnote =

| absmag_v = −7.8

}}

{{Starbox detail

| mass = 14.3

| radius = {{val|477|28|22}}

| temperature = {{val|5495|fmt=commas}}; {{nowrap|({{val|4100|68|fmt=commas}}{{snd}}6,500)}}

| luminosity = {{val|96600|26100|fmt=commas}}

| gravity = 0.30

| metal_fe = −0.25

| rotational_velocity =

}}

{{Starbox catalog

| names = CD−31°4910, GSC 07106-03582, HIP 37415, HR 2974, HD 62058

}}

{{Starbox reference

| Simbad = R+Puppis

}}

File:NGC 2439 DSS.jpg, with R Puppis the brightest star]]

R Puppis is a variable star in the constellation Puppis. It is a rare yellow hypergiant and a candidate member of the open cluster NGC 2439. It is also an MK spectral standard for the class G2 0-Ia.

Variability

File:RPupLightCurve.png light curve for R Puppis, plotted from ASAS data]]

R Puppis was identified as a variable star in 1879, and described as having a range of over a magnitude. Numerous observations over the following 100 years failed to confirm the variations, until the 1970s when clear brightness changes were observed. These were confirmed by later observations, but with a total visual amplitude of only about 0.2 magnitudes.

Variable stars such as R Puppis have been described as pseudo-Cepheids, because they lie above the high-luminosity portion of the instability strip and their variations are similar to those of Cepheids although less regular. R Puppis is formally classified as a semiregular variable of type SRd, meaning F, G, or K giants or supergiants.

References

{{reflist|refs=

{{cite journal

| bibcode=2022yCat.1354....0A

| title=VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)

| last1=Anders |first1=F. |last2=Khalatyan |first2=A.

| last3=Queiroz |first3=A. B. A. |last4=Chiappini |first4=C.

| last5=Ardevol |first5=J. |last6=Casamiquela |first6=L.

| last7=Figueras |first7=F. |last8=Jimenez-Arranz |first8=O.

| last9=Jordi |first9=C. |last10=Monguio |first10=M.

| last11=Romero-Gomez |first11=M. |last12=Altamirano |first12=D.

| last13=Antoja |first13=T. |last14=Assaad |first14=R.

| last15=Cantat-Gaudin |first15=T. |last16=Castro-Ginard |first16=A.

| last17=Enke |first17=H. |last18=Girardi |first18=L.

| last19=Guiglion |first19=G. |last20=Khan |first20=S.

| last21=Luri |first21=X. |last22=Miglio |first22=A.

| last23=Minchev |first23=I. |last24=Ramos |first24=P.

| last25=Santiago |first25=B. X. |last26=Steinmetz |first26=M.

| journal=Vizier Online Data Catalog |year=2022 }}

{{cite web |title=ASAS All Star Catalogue |url=http://www.astrouw.edu.pl/asas/?page=aasc |publisher=The All Sky Automated Survey |access-date=8 December 2021}}

{{cite journal |bibcode=1978IBVS.1473....1S |title=R Pup - a Variable after all |journal=Information Bulletin on Variable Stars |date=September 1978 |last1=Stift |first1=M. J. |volume=1473 |page=1 }}

{{cite journal |bibcode=1983AJ.....88..386E |doi=10.1086/113323 |title=Pseudocepheids. I. R Puppis, HR 4441, HR 4511, and AI CMi |author1=Eggen, O. J. |journal=Astronomical Journal |volume=88 |pages=386–403 |date=March 1983 }}

{{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

| last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C.

| title=The Perkins catalog of revised MK types for the cooler stars

| journal=Astrophysical Journal Supplement Series

| volume=71 | pages=245 | year=1989

| bibcode=1989ApJS...71..245K | doi=10.1086/191373 | s2cid=123149047 }}

{{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|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

{{cite journal|bibcode=2011AstL...37..499U|title=Spectroscopic studies of Cepheids (S Cru, AP Pup, AX Cir, S TrA, T Cru, R Mus, S Mus, U Car) and semiregular bright supergiants (V382 Car, HD 75276, R Pup) in the southern hemisphere|journal=Astronomy Letters|volume=37|issue=7|pages=499|last1=Usenko|first1=I. A.|last2=Kniazev|first2=A. Yu.|last3=Berdnikov|first3=L. N.|last4=Kravtsov|first4=V. V.|s2cid=122968535|year=2011|doi=10.1134/S1063773711070061}}

{{cite journal|bibcode=1990A&A...239..205A|title=Colour excesses and absolute magnitudes for non-Cepheid F-G supergiants from uvbybeta photometry|journal=Astronomy and Astrophysics|volume=239|pages=205|last1=Arellano Ferro|first1=A.|last2=Parrao|first2=L.|year=1990}}

{{cite journal

| last1=Garcia | first1=B.

| title=A list of MK standard stars

| journal=Bulletin d'Information du Centre de Données Stellaires

| volume=36 | pages=27 | year=1989

| bibcode=1989BICDS..36...27G }}

}}

Category:Semiregular variable stars

Category:G-type hypergiants