rho1 Cephei

{{other stars by Bayer designation|Rho Cephei{{!}}ρ Cephei}}

{{Starbox begin

| name = Rho¹ Cephei

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Cepheus

| ra = {{RA|22|26|42.40624}}

| dec = {{DEC|+78|47|09.0725}}

| appmag_v = 5.84

}}

{{Starbox character

| class = A2m

| b-v = −0.16

| u-b =

| r-i =

| variable =

}}

{{Starbox astrometry

| radial_v =

| prop_mo_ra = −13.33

| prop_mo_dec = −36.95

| parallax = 15.83

| p_error = 0.23

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| source =

| component1 = ρ¹ Cep A

| mass = 2.00

| radius =

| luminosity =

| temperature =

| gravity =

| metal_fe =

| rotational_velocity = 81

| age_myr = 320

| component2 = ρ¹ Cep B

| mass2 = 0.51

}}

{{Starbox catalog

| names = ρ¹ Cep, 28 Cep, BD+78°796, HD 213403, HIP 110787, HR 8578, SAO 10375, WDS J22267+7847AB

}}

{{Starbox reference

| Simbad = rho01+Cep

}}

Rho¹ Cephei (ρ¹ Cephei) is a double star located in the northern constellation of Cepheus. As of 2014, the pair had an angular separation of 0.29 arc seconds along a position angle of 211.1°. This corresponds to a projected separation of 18.1 AU. Rho¹ Cephei is faintly visible to the naked eye with an apparent visual magnitude of 5.84, and it forms an optical pair with the brighter star Rho² Cephei. Based upon an annual parallax shift of 15.83 mas as seen from the Earth, Rho¹ Cephei is located about 206 light years from the Sun.

The primary component is a chemically peculiar Am star with a stellar classification of A2m. It has twice the mass of the Sun and is around 320 million years old. The smaller companion may be the source of the X-ray emission from this location, as stars similar to the primary component do not generally produce detectable levels of X-rays.

References

{{reflist|refs=

{{citation

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| arxiv=0708.1752 | bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}

{{citation

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| journal=Astronomy and Astrophysics Supplement Series

| volume=89 | issue=2 | pages=415–419 | date=August 1991

| bibcode=1991A&AS...89..415O | postscript=. }}

{{citation

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| last10=Bessell | first10=M. | last11=Doyon | first11=R.

| title=The Volume-limited A-Star (VAST) survey - I. Companions and the unexpected X-ray detection of B6-A7 stars

| journal=Monthly Notices of the Royal Astronomical Society

| volume=415 | issue=1 | pages=854–866 | date=July 2011

| doi=10.1111/j.1365-2966.2011.18765.x | doi-access=free | bibcode=2011MNRAS.415..854D

| postscript=. | arxiv=1103.4363 | s2cid=84181878 }}

{{citation

| last1=De Rosa | first1=R. J. | last2=Patience | first2=J.

| last3=Wilson | first3=P. A. | last4=Schneider | first4=A.

| last5=Wiktorowicz | first5=S. J. | last6=Vigan | first6=A.

| last7=Marois | first7=C. | last8=Song | first8=I.

| last9=MacIntosh | first9=B. | last10=Graham | first10=J. R.

| last11=Doyon | first11=R. | last12=Bessell | first12=M. S.

| last13=Thomas | first13=S. | last14=Lai | first14=O.

| title=The VAST Survey - III. The multiplicity of A-type stars within 75 pc

| journal=Monthly Notices of the Royal Astronomical Society

| bibcode=2014MNRAS.437.1216D | doi=10.1093/mnras/stt1932

| doi-access=free | arxiv=1311.7141 | s2cid=88503488 | postscript=. }}

{{citation

| display-authors=1 | last1=Royer | first1=F.

| last2=Grenier | first2=S. | last3=Baylac | first3=M.-O.

| last4=Gómez | first4=A. E. | last5=Zorec | first5=J.

| title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i

| journal=Astronomy and Astrophysics

| volume=393 | pages=897–911 | date=October 2002

| doi=10.1051/0004-6361:20020943 | bibcode=2002A&A...393..897R

| arxiv=astro-ph/0205255 | s2cid=14070763 | postscript=. }}

{{cite simbad

| title=rho01 Cep

| accessdate=2017-05-05 | postscript=. }}

}}

Cephei, Rho1

Category:Am stars

Category:Double stars

Category:Cepheus (constellation)

Category:Durchmusterung objects