Omega Andromedae

{{Short description|Binary star system in the constellation Andromeda}}

{{Starbox begin

| name = ω Andromedae

}}

{{Starbox image

| image=

{{Location mark

|image=Andromeda constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=8|mark_link=ω And

|x=362|y=290

}}

|caption=Location of χ Andromedae (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Andromeda

| ra = {{RA|01|27|39.38072}}

| dec = {{DEC|+45|24|24.0651}}

| appmag_v = +4.83

}}

{{Starbox character

| class = F5 IVe or {{nowrap|F3 V + F5 V}}

| b-v = +0.42

| u-b = +0.00

| variable =

}}

{{Starbox astrometry

| radial_v = +14.7

| prop_mo_ra = {{val|357.564|(127)}}

| prop_mo_dec = {{val|−110.039|(118)}}

| parallax = 34.7332

| p_error = 0.1341

| parallax_footnote =

| absmag_v = +2.57

}}

{{Starbox orbit

| reference =

| period_unitless = 254.9 days

| axis = {{val|0.038|0.001}}

| eccentricity = {{val|0.142|0.012}}

| inclination = {{val|62.49|2.10}}

| k1 = {{val|17.54|0.30}}

| k2 = {{val|19.62|0.30}}

}}

{{Starbox detail

| component1 = ω And A

| mass = {{Val|0.963|0.049}}

| radius = 2.2

| luminosity = 7.1

| temperature = 6,628

| metal_fe = −0.16

| rotational_velocity = 57.1

| age_gyr = 2.1

| component2 = ω And B

| mass2 = {{Val|0.860|0.051}}

}}

{{Starbox catalog

| names = 48 Andromedae, BD+44°307, FK5 1040, HD 8799, HIP 6813, HR 417, SAO 37228, PPM 44006

}}

{{Starbox reference

| Simbad = HD+8799

}}

Omega Andromedae (ω And, ω Andromedae) is a binary star system in the northern constellation of Andromeda. Parallax measurements made during the Gaia mission make this system to be approximately {{Convert|93.9|ly|pc|abbr=off|lk=on}} from Earth. Its apparent visual magnitude is +4.83, which makes it bright enough to be seen with the naked eye.

The primary component has a stellar classification of F5 IVe. The IV luminosity class indicates that it is probably a subgiant star that is in the process of evolving away from the main sequence as the supply of hydrogen at its core depletes. However, Abt (1985) gives a classification of F3 V, suggesting it is an F-type main-sequence star. The measured angular diameter of the primary star is {{nowrap|0.70 ± 0.03 mas}}. At the system's estimated distance this yields a size of about 2.2 times that of the Sun. It is emitting about seven times solar luminosity from its outer atmosphere at an effective temperature of {{val|6628|ul=K|fmt=commas}}. This heat gives it the yellow-white-hued glow of an F-type star.

In 2008, the companion star was resolved using adaptive optics at the Lick Observatory. Later observations showed the magnitude difference between the two stars is 3.65 ± 0.03 and they are separated by 0.669 arcsecond. Abt (1985) lists the class as F5 V.

References

{{Reflist|refs=

{{citation

| title=Separated Fringe Packet Observations with the CHARA Array. II. ω Andromeda, HD 178911, and ξ Cephei

| last1=Farrington | first1=C. D. | last2=ten Brummelaar | first2=T. A.

| last3=Mason | first3=B. D. | last4=Hartkopf | first4=W. I.

| last5=Mourard | first5=D. | last6=Moravveji | first6=E.

| last7=McAlister | first7=H. A. | last8=Turner | first8=N. H.

| last9=Sturmann | first9=L. | last10=Sturmann | first10=J.

| journal=The Astronomical Journal | display-authors=1

| doi=10.1088/0004-6256/148/3/48 | bibcode=2014AJ....148...48F

| arxiv=1407.0639 | s2cid=12909818 | postscript=. }}

{{citation | title=The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs | display-authors=1 | last1=Nordström | first1=B. | last2=Mayor | first2=M. | last3=Andersen | first3=J. | last4=Holmberg | first4=J. | last5=Pont | first5=F. | last6=Jørgensen | first6=B. R. | last7=Olsen | first7=E. H. | last8=Udry | first8=S. | last9=Mowlavi | first9=N. | journal=Astronomy and Astrophysics | volume=418 | pages=989–1019 |date=May 2004 | doi=10.1051/0004-6361:20035959 | bibcode=2004A&A...418..989N | arxiv=astro-ph/0405198 | s2cid=11027621 | postscript=. }}

{{citation | postscript=. | last1=Schröder | first1=C. | last2=Reiners | first2=Ansgar | last3=Schmitt | first3=Jürgen H. M. M. | title=Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo | journal=Astronomy and Astrophysics | volume=493 | issue=3 | pages=1099–1107 | date=January 2009 | doi=10.1051/0004-6361:200810377 | bibcode=2009A&A...493.1099S | doi-access=free }}

{{citation | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | date=1966 | page=99 | bibcode=1966CoLPL...4...99J | postscript=. }}

{{cite simbad | title=ome And | access-date=2012-06-26 | mode=cs2 | postscript=. }}

{{citation | last1=Gladysz | first1=Szymon | last2=Christou | first2=Julian C. | title=Reference-Less Detection, Astrometry, and Photometry of Faint Companions with Adaptive Optics | journal=The Astrophysical Journal | volume=698 | issue=1 | pages=28–42 |date=June 2009 | doi=10.1088/0004-637X/698/1/28 | bibcode=2009ApJ...698...28G | postscript=. |arxiv = 0805.1870 | s2cid=44505644 }}

{{citation | display-authors=1 | last1=do Nascimento | first1=J. D. Jr. | last2=Canto Martins | first2=B. L. | last3=Melo | first3=C. H. F. | last4=Porto de Mello | first4=G. | last5=De Medeiros | first5=J. R. | title=On the link between rotation, chromospheric activity and Li abundance in subgiant stars | journal=Astronomy and Astrophysics | volume=405 | pages=723–731 |date=July 2003 | issue=2 | doi=10.1051/0004-6361:20030633 | bibcode=2003A&A...405..723D | arxiv=astro-ph/0307196 | s2cid=1106754 | postscript=. }}

{{citation | postscript=. | last1=Richichi | first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | volume=431 | pages=773–777 |date=February 2005 | issue=2 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R | doi-access=free }}

{{citation | postscript=. | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3rd | publisher=Birkhäuser | date=2006 | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 }}. The radius (R_*) is given by:

: $\begin{align} 2\cdot R_*
& = \frac{(28.6\cdot 0.70\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
& \approx 4.31\cdot R_{\bigodot}
\end{align}$

{{citation | title=The Colour of Stars | date=December 21, 2004 | work=Australia Telescope, Outreach and Education | publisher=Commonwealth Scientific and Industrial Research Organisation | url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | access-date=2012-01-16 | postscript=. | archive-url=https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | archive-date=March 18, 2012 | url-status=dead }}

}}

External links

[http://aladin.u-strasbg.fr/AladinPreview?-c=NLTT++4832&ident=NLTT++4832&submit=Aladin+previewer Image ω Andromedae]

008799

Andromedae, Omega

Andromedae, 48

Category:Andromeda (constellation)

Category:F-type subgiants

006813

0417

Category:Durchmusterung objects

Category:Binary stars

Category:F-type main-sequence stars