TW Andromedae

{{Starbox begin

| name= TW Andromedae }}

{{Starbox image

| image = 250px

| caption = The visual band light curve of TW Andromedae, plotted from data published by Ammann & Walter

}}

{{Starbox observe

| epoch=J2000

| ra={{RA|00|03|18.22724}}{{cite DR2}}

| dec={{DEC|+32|50|45.10209}}

| appmag_v= 8.98 – 11.050 variable

| constell=Andromeda }}

{{Starbox character

| class=F0V + K0

| b-v= 0.11

| u-b=

| variable=EA

}}

{{Starbox astrometry

| radial_v= {{val|-51.27|0.42}}

| prop_mo_ra=52.569 ± 0.053

| prop_mo_dec=-2.770 ± 0.028

| parallax= 3.1877

| p_error= 0.0442

| parallax_footnote =

| absmag_v=

}}

{{Starbox orbit

| reference =

| period_unitless = 4.12 days

| axis_unitless = 13.6 {{solar radius}}

| eccentricity = 0.0

| periarg =

| inclination = 86.9

| periastron = JD {{val|2,440,700|300}}

| k1 = {{val|27|1.5}}

| k2 = {{val|140|2.0}}

}}

{{Starbox detail

| component1 = TW And A

| mass = 1.685{{cite journal

| title=Semidetached double-lined eclipsing binaries: Stellar parameters and rare classes

| last=Malkov | first=Oleg Yu

| journal=Monthly Notices of the Royal Astronomical Society

| volume=491 | issue=4 | pages=5489–5497 | date=February 2020

| doi=10.1093/mnras/stz3363 | bibcode=2020MNRAS.491.5489M | doi-access=free }}

| radius = 2.05

| temperature = 7250{{±|25}}

|luminosity=4.3

| component2 = TW And B

| mass2 = 0.325

| radius2 = 3.20

| temperature2 = 4658

|luminosity2=14.5

}}

{{Starbox catalog

| names=HIP 262, 2MASS J00031822+3250451, SAO 53603, BD+32 4756, TYC 2263-975-1}}

{{Starbox reference |

Simbad=TW+And

}}

TW Andromedae (TW And) is an eclipsing binary star, classified also as an Algol variable star, in the constellation Andromeda. Its brightness varies with a period of 4.12 days, and has a typical brightness of magnitude 8.98 but decreasing down to a magnitude of 11.04 during the main eclipse.

TW Andromedae was discovered to be an Algol variable by August Kopff in 1909.

The TW Andromedae system is made of two stars in a circular orbit around their center of mass, with an orbital plane almost parallel to our line of sight. The presence of a third body in the system, with a minimum mass of 0.27 {{solar mass|link=yes}} and an orbital period of 49.6 years, has been proposed to account for the observed changes in the period of the variability.

Like in all Algol variable stars, when both stars of the system are aligned with respect to our line of sight, the furthest component blocks the light of the other, thus the apparent luminosity of the system diminishes. When the brightest component eclipses the other, a secondary, less pronounced minimum in the luminosity occurs.

References

{{reflist |refs=

{{cite journal |last1=Ammann |first1=M. |last2=Walter |first2=K. |title=Photoelectric light curve of the Algol system TW Andromedae and the interpretation of its distortions by the effects of hot spots |journal=Astronomy and Astrophysics |date=April 1973 |volume=24 |page=131 |bibcode=1973A&A....24..131A |url=https://ui.adsabs.harvard.edu/abs/1973A%26A....24..131A/abstract |access-date=6 October 2021}}

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?V*%20TW%20And TW And], database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?II/250 II/250] Accessed on line 2009-06-30.

{{citation

| last1=Høg | first1=E. | last2=Fabricius | first2=C.

| last3=Makarov | first3=V. V. | last4=Urban | first4=S.

| last5=Corbin | first5=T. | last6=Wycoff | first6=G.

| last7=Bastian | first7=U. | last8=Schwekendiek | first8=P.

| last9=Wicenec | first9=A.

| title=The Tycho-2 catalogue of the 2.5 million brightest stars

| journal=Astronomy & Astrophysics

| volume=355 | pages=L27–L30 | year=2000

| bibcode=2000A&A...355L..27H | postscript=. }}

{{citation

| last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C.

| title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project

| journal=Astronomy & Astrophysics

| volume=546 | id=A61 | pages=14 | date=October 2012

| doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D

| arxiv=1208.3048 | s2cid=59451347 | postscript=. }}

{{citation

| last1=Kreiner | first1=J. M. | last2=Pribulla | first2=T.

| last3=Tremko | first3=J. | last4=Stachowski | first4=G. S.

| last5=Zakrzewski | first5=B.

| title=Period analysis of three close binary systems: TW And, TT Her and W UMi

| journal=Monthly Notices of the Royal Astronomical Society

| volume=383 | issue=4 | pages=1506–1512 | year=2008

| bibcode=2008MNRAS.383.1506K | postscript=. | doi=10.1111/j.1365-2966.2007.12652.x | doi-access= free}}

{{citation

| last1=Rattenbury | first1=N. J.

| title=Microlensing of close binary stars

| journal=Monthly Notices of the Royal Astronomical Society

| volume=392 | issue=1 | pages=439–447 | date=January 2009

| doi=10.1111/j.1365-2966.2008.14074.x | doi-access=free

| bibcode=2009MNRAS.392..439R

| postscript=. | arxiv=0810.2265| s2cid=19012830

}}

{{cite journal

| last1=Kopff | first1=August

| title=Beobachtungen des Algolvariablen 21.1909 Andromedae (BD +32°4756)

| journal=Astronomische Nachrichten | date=December 1909 | volume=183 | issue=7

| page=109

| doi=10.1002/asna.19091830704 | bibcode=1909AN....183..109K

| url=https://onlinelibrary.wiley.com/doi/pdf/10.1002/asna.19091830704 | access-date=24 February 2023}}

}}

Category:Andromeda (constellation)

Category:Algol variables

Category:F-type main-sequence stars