2 Persei

{{Starbox observe

| epoch = J2000

| constell = Perseus

| ra = {{RA|01|52|09.3723}}

| dec = {{DEC|+50|47|34.054}}

| appmag_v = 5.70

}}

{{Starbox character

| class = B9pHgMn

| b-v = {{Val|−0.067|0.004}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|11.4|0.2}}

| prop_mo_ra = +17.532

| prop_mo_dec = −29.090

| parallax = 6.8219

| p_error = 0.1092

| parallax_footnote =

| absmag_v = −0.14

}}

{{Starbox orbit

| reference =

| primary = 2 Persei A

| name = 2 Persei B

| period_unitless = {{val|5.62698|0.00002|u=days}}

| eccentricity = {{val|0.024|0.011}}

| periastron = {{val|2440281.3|0.4|u=JD}}

| periarg =

| periarg_primary = {{val|208|24}}

| k1 = {{val|26.5|0.3}}

}}

{{Starbox detail

| source =

| mass = 3.2

| radius = 3.7

| luminosity = 156

| gravity = 3.74

| temperature = 11,218

| metal_fe = −0.74

| rotation =

| rotational_velocity = 25

| age_myr = 233

}}

{{Starbox catalog

| names = {{odlist | BD=+50°379 | FK5=1052 | HD=11291 | HIP=8714 | HR=536 | SAO=22696 }}

}}

{{Starbox reference

| Simbad = 2+Persei

}}

2 Persei is a binary star system in the northern constellation Perseus, located around 500 light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude is 5.70. The system is moving further away from the Earth with a heliocentric radial velocity of 11 km/s.

In 1970 radial velocity measurements from spectrograms taken at David Dunlap Observatory indicated it was a single-lined spectroscopic binary. Follow up observations led to the determination that it had a nearly circular orbit with a period of 5.6 days. The visible component is a chemically peculiar mercury-manganese star with a stellar classification of B9pHgMn. Other analyses of its spectrum have assigned it the giant star spectral type of B9III.

References

{{reflist|refs=

{{cite journal

| last1=Sato | first1=K.

| last2=Kuji | first2=S.

| title=MK classification and photometry of stars used for time and latitude observations at Mizusawa and Washington

| journal=Astronomy and Astrophysics Supplement Series

| volume=85 | issue=3 | pages=1069–1087 | date=November 1990

| bibcode=1990A&AS...85.1069S

}}

{{cite journal

| display-authors=1 | last1=Abt | first1=Helmut A.

| last2=Levato | first2=Hugo | last3=Grosso | first3=Monica

| title=Rotational Velocities of B Stars

| journal=The Astrophysical Journal

| volume=573 | issue=1 | pages=359–365 | date=July 2002

| doi=10.1086/340590 | bibcode=2002ApJ...573..359A | doi-access=free }}

{{cite journal

| title=XHIP: An extended hipparcos compilation

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

| journal=Astronomy Letters

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

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

{{cite journal

| last1=Cowley | first1=A. | last2=Cowley | first2=C.

| last3=Jaschek | first3=M. | last4=Jaschek | first4=C.

| title=A study of the bright A stars. I. A catalogue of spectral classifications

| display-authors=1 | journal=Astronomical Journal

| volume=74 | pages=375–406 | date=April 1969

| doi=10.1086/110819 | bibcode=1969AJ.....74..375C }}

{{cite journal | title=The radial velocities of 335 late B-type stars | last1=Hube | first1=Douglas P. | journal=Memoirs of the Royal Astronomical Society | volume=72 | pages=233–280 | year=1970 | bibcode=1970MmRAS..72..233H }}

{{cite journal | title=The orbit of the spectroscopic binary HD 11291 | last1=Heard | first1=J. F. | last2=Krautter | first2=A. | journal=Journal of the Royal Astronomical Society of Canada | volume=69 | pages=22–24 | year=1975 | bibcode=1975JRASC..69...22H }}

}}

Category:B-type giants

Category:Mercury-manganese stars

Category:Spectroscopic binaries

Category:Perseus (constellation)

Category:Durchmusterung objects