BP Circini

{{Starbox image

| image = 250px

| caption = A light curve for BP Circini, plotted from Hipparcos data

}}

{{Starbox observe

| epoch = J2000.0

| constell = Circinus

| ra = {{RA|14|46|41.98011}}

| dec = {{DEC|−61|27|42.9903}}

| appmag_v = 7.37 - 7.71

}}

{{Starbox character

| type =

| class = {{nowrap|F2/3II + B6V}}

| b-v = {{val|0.649|0.020}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v =

| prop_mo_ra = −5.355

| prop_mo_dec = −3.920

| parallax = 0.9952

| p_error = 0.0402

| parallax_footnote =

| absmag_v = −2.91

}}

{{Starbox orbit

| reference =

| period = 20

| axis_unitless = {{val|15.8|ul=AU}}

| eccentricity =

| inclination =

| node =

| periastron =

| periarg =

| periarg_primary =

| k1 =

| k2 =

}}

{{Starbox detail

| component1 = A

| mass = 5

| radius = {{val|30.38|6.93|6.50}}

| luminosity = {{val|917|54}}

| gravity = 2.75

| temperature = {{val|6356|23}}

| metal_fe =

| rotation =

| rotational_velocity =

| age_myr =

| component2 = B

| mass2 = 4.7

| gravity2 = {{val|4.0|0.5}}

| temperature2 = {{val|16000|1000|fmt=commas}}

}}

{{Starbox catalog

| names = {{odlist | V=BP Cir | CD=−60°5320 | HD=129708 | HIP=72264 | SAO=252879 | WDS=J14467-6128A }}

}}

{{Starbox reference

| Simbad = BP+Cir

}}

BP Circini is a binary star system in the southern constellation of Circinus. It is located at a distance of approximately 3,300 light years from the Sun based on parallax.

The variability of this star was discovered by D. W. Kurtz in 1979. A small-amplitude Cepheid variable, its apparent magnitude ranges from 7.37 to 7.71 over 2.39810 days. A spectroscopic binary, the primary is a yellow-white bright giant of spectral type F2 or F3II. The spectrum shows peculiarities in the metallic lines. The secondary is a 4.7 solar mass ({{Solar mass|link=yes}}) blue-white main sequence star of spectral type B6.

References

{{reflist|refs=

{{cite journal

| title=HD 129708: A New, Bright, Short-Period Cepheid with an Unusual Spectrum

| last=Kurtz | first=D. W.

| journal=Monthly Notes of the Astronomical Society of Southern Africa

| volume=38 | page=36 | date=1979

| bibcode=1979MNSSA..38...36K }}

{{citation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| title=XHIP: An extended hipparcos compilation

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | arxiv=1108.4971

| doi=10.1134/S1063773712050015 | s2cid=119257644 | postscript=. }}

{{cite journal

| title=The orbits of southern binary Cepheids

| display-authors=1 | last1=Petterson | first1=O. K. L.

| last2=Cottrell | first2=P. L. | last3=Albrow | first3=M. D.

| journal=Monthly Notices of the Royal Astronomical Society

| volume=350 | issue=1 | pages=95–112 | date=May 2004

| doi=10.1111/j.1365-2966.2004.07555.x | bibcode=2004MNRAS.350...95P | doi-access=free }}

{{cite web |title=Hipparcos Tools Interactive Data Access |url=https://www.cosmos.esa.int/web/hipparcos/interactive-data-access |website=Hipparcos |publisher=ESA |access-date=8 December 2021}}

{{citation

| last1=Skiff | first1=B. A.

| title=General Catalogue of Stellar Spectral Classifications

| journal=VizieR Online Data Catalog

| date=October 2014 | bibcode=2014yCat....1.2023S }}

{{cite journal

| title=Spectroscopic studies of Cepheids in Circinus (AV Cir, BP Cir) and Triangulum Australe (R TrA, S TrA, U TrA, LR TrA)

| last1=Usenko | first1=I. A. | last2=Kniazev | first2=A. Yu.

| last3=Berdnikov | first3=L. N. | last4=Kravtsov | first4=V. V.

| display-authors=1 | journal=Astronomy Letters

| volume=40 | issue=12 | pages=800–820 | date=December 2014

| doi=10.1134/S1063773714110061 | bibcode=2014AstL...40..800U | s2cid=122745580 }}