28 Andromedae

{{Starbox image

| image=

{{Location mark

|image=Andromeda constellation map.svg|alt=|float=center|width=260

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=28 Andromedae

|x=678|y=722

}}

|caption=Location of 28 Andromedae (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Andromeda

| ra = {{RA|00|30|07.36}}

| dec = {{DEC|+29|45|05.6}}

| appmag_v = 5.214{{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}}

}}

{{Starbox character

| class = A7 III{{cite journal|title= MK Spectral Types for Some Bright F Stars|author1=Cowley, A.|author2=Fraquelli, D.|journal=Publications of the Astronomical Society of the Pacific|volume=86|number=509|page=70|date=1974|bibcode=1974PASP...86...70C|doi=10.1086/129562|doi-access=free}}

| b-v = +0.26

| u-b = +0.08{{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|date=1986|bibcode= 1986EgUBV........0M}}

| variable = δ Sct

}}

{{Starbox astrometry

| radial_v = {{val|-10.3|0.6}}{{cite journal|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|author=Gontcharov, G. A.|date=2006|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|bibcode=2006AstL...32..759G|doi=10.1134/S1063773706110065|arxiv=1606.08053|s2cid=119231169}}

| prop_mo_ra = {{val|44.983|0.344}}

| prop_mo_dec = {{val|55.668|0.176}}

| parallax = 16.3540

| p_error = 0.1743

| parallax_footnote =

| absmag_v = 1.29{{cite journal

| display-authors=1 | last1=Huang | first1=W.

| last2=Wallerstein | first2=G. | last3=Stone | first3=M.

| title=A catalogue of Paschen-line profiles in standard stars

| journal=Astronomy & Astrophysics

| volume=547 | pages=A62 | year=2012

| bibcode=2012A&A...547A..62H | arxiv=1210.7893

| doi=10.1051/0004-6361/201219804 | s2cid=119286159 }}

}}

{{Starbox detail

| mass = 1.77

| radius = 3.19

| luminosity = 25.007

| temperature = {{val|7335|69|fmt=commas}}{{cite journal|author1=Prugniel, Ph.|title=The atmospheric parameters and spectral interpolator for the MILES stars|date=1986|bibcode= 2011A&A...531A.165P|doi=10.1051/0004-6361/201116769|arxiv=1104.4952|journal=Astronomy & Astrophysics|volume=531|pages=A165|s2cid=54940439}}

| metal_fe = {{val|-0.09|0.05}}

| gravity = {{val|3.95|0.06}}

| rotational_velocity = {{val|21|2}}

| age_gyr = 1.159

}}

{{Starbox catalog

| names = BD+28°75, HD 2628, HIP 2355, HR 114, SAO 74041, PPM 89834

}}

{{Starbox reference

| Simbad = HD+2628

}}

28 Andromedae (abbreviated 28 And) is a Delta Scuti variable star in the constellation Andromeda. 28 Andromedae is the Flamsteed designation. It also bears the variable star name GN Andromedae. Its apparent magnitude is 5.214, varying by less than 0.1 magnitudes.

Description

28 Andromedae is an A-type giant star, meaning it is colored bluish-white. Parallax estimates made by the Hipparcos spacecraft put the star at a distance of about 199 light years (61 parsecs). It is moving towards the solar system at a velocity of {{val|10.30|ul=km/s}}.

Multiplicity of the system

Image:28AndLightCurve.png light curve, normalized to zero mean, of 28 Andromedae, adapted from Garrido et al.]]

Two stars near 28 Andromedae share a common proper motion with the primary star, which is then a candidate triple system. The orbital parameters are currently unknown. The second and third component have masses of {{solar mass|0.71|link=yes}} and {{solar mass|0.14|link=yes}} respectively.

Variability cycle

28 Andromedae A is a Delta Scuti variable, so it displays small luminosity variations at timescales less than a day due to star pulsation. There is evidence for two periodic cycles of 5,014 and 5,900 seconds, respectively. The amplitude variations, though, are not constant in time, and the pulsation modes are not radial.

References

{{Reflist|refs=

{{cite journal |last1=Garrido |first1=R. |last2=Gonzalez |first2=S. F. |last3=Rolland |first3=A. |last4=Hobart |first4=M. A. |last5=Coca |first5=P. Lopez-De |last6=Pena |first6=J. H. |title=Light variations of 28 Andromedae |journal=Astronomy & Astrophysics |date=1985 |volume=144 |pages=211–214 |bibcode=1985A&A...144..211G |url=http://articles.adsabs.harvard.edu/pdf/1985A%26A...144..211G |access-date=9 October 2021}}

{{cite journal | title=Extreme amplitude variations in 28 And | last1=Rodriguez | first1=E. | last2=Rolland | first2=A. | last3=Lopez-Gonzalez | first3=M. J. | last4=Costa | first4=V. | journal=Astronomy and Astrophysics | volume=338 | pages=905–908 | year=1998 | bibcode=1998A&A...338..905R }}

{{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |s2cid = 18759600}}[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=2349 Vizier catalog entry ]

{{cite journal

| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A.

| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets

| journal=The Astrophysical Journal

| volume=804 | issue=2 | pages=146 | year=2015

| bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146

| arxiv=1501.03154 | s2cid=33401607 }}

{{cite journal | title=The VAST Survey - III. The multiplicity of A-type stars within 75 pc | 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. | journal=Monthly Notices of the Royal Astronomical Society | volume=437 | issue=2 | pages=1216–1240 | year=2014 | bibcode=2014MNRAS.437.1216D| doi=10.1093/mnras/stt1932 | arxiv=1311.7141 | doi-access=free }}

{{cite journal | title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i | last1=Royer | first1=F. | last2=Grenier | first2=S. | last3=Baylac | first3=M. -O. | last4=Gómez | first4=A. E. | last5=Zorec | first5=J. | journal=Astronomy and Astrophysics | volume=393 | pages=897–911 | year=2002 | bibcode=2002A&A...393..897R| arxiv=astro-ph/0205255 | doi=10.1051/0004-6361:20020943 | s2cid=14070763 }}

{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|pages=B/gcvs|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

}}

External links

[http://aladin.u-strasbg.fr/AladinPreview?-c=V*+GN+And&ident=V*+GN+And&submit=Aladin+previewer Image 28 Andromedae]
{{cite web|url=https://www.universeguide.com/star/28andromedae|title=28 Andromedae|access-date=2018-10-03|archive-date=2018-10-03|archive-url=https://web.archive.org/web/20181003181658/https://www.universeguide.com/star/28andromedae|url-status=dead}}

Category:Andromeda (constellation)

Category:Delta Scuti variables

Category:Durchmusterung objects

Category:A-type giants

Andromedae, GN