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{{Starbox begin
| name = 15 Andromedae
}}{{Starbox observe
| epoch = J2000.0
| constell = Andromeda
| ra = {{RA|23|34|37.53652}}[1]
| dec = {{DEC|+40|14|11.1795}}[1]
| appmag_v = 5.55[3]
}}{{Starbox character
| class = A1 III,[4] A1 Va,[5] or kA1hA3mA0.5 Va+.[6]
| b-v = {{Val|0.096|0.005}}[3]
| u-b = 0.08
| variable = δ Sct[8]
}}{{Starbox astrometry
| radial_v ={{Val|13.1|0.6}}[3]
| prop_mo_ra = -18.165
| prop_mo_dec = −46.183[1]
| parallax = 12.9406
| p_error = 0.0973
| parallax_footnote = [1]
| absmag_v = {{Val|+1.16|0.16}}[12]
}}{{Starbox detail
| source = [4]
| mass = 2.7
| radius =
| luminosity = 27
| temperature = 9,225
| metal_fe =
| gravity = {{Val|3.90|0.03}}[12]
| rotational_velocity = 105[12]
| age_myr = 130
}}{{Starbox catalog
| names = {{odlist | V=V340 And | F=15 And | BD=+39° 5114 | HD=221756 | HIP=116354 | HR=8947 | SAO=73346 | FK5=1616 }}
}}{{Starbox reference
| Simbad = 15+And
}}{{Starbox end}}15 Andromedae, abbreviated 15 And, is a single,[17] variable star[8] in the northern constellation of Andromeda. 15 Andromedae is the Flamsteed designation, while its variable star designation is V340 And.[ Its apparent visual magnitude is 5.55,[3] which indicates it is faintly visible to the naked eye. Its estimated distance from the Earth is 252 light years, and it is moving further away with a heliocentric radial velocity of 13 km/s.[3]]Depending on the source, this star has been classified as a giant star with a stellar classification of A1 III,[4] an A-type main-sequence star with a class of A1 Va,[5] or a Lambda Boötis star with a class of kA1hA3mA0.5 Va+.[6] It is a Delta Scuti variable that changes in brightness by 0.03 magnitude.[8] Two variability cycles, with periods 0.0403 and 0.0449 days, have been observed, a common feature for Lambda Boötis stars.[26] The star is around 130[4] million years old and has a high rotation rate, showing a projected rotational velocity of 105 km/s.[12] It has 2.7 times the mass of the Sun and is radiating 27 times the Sun's luminosity from its photosphere at an effective temperature of 9,225 K.[4] This system has an excess emission of infrared radiation that suggests the presence of an orbiting disk of dust at a distance of around 50 AU from the host star.[4] References1. ^1 2 3 4 {{cite DR2}}
2. ^1 {{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | postscript=. }}
3. ^1 2 3 4 5 6 {{citation | display-authors=1 | last1=Wyatt | first1=M. C. | last2=Smith | first2=R. | last3=Su | first3=K. Y. L. | last4=Rieke | first4=G. H. | last5=Greaves | first5=J. S. | last6=Beichman | first6=C. A. | last7=Bryden | first7=G. | title=Steady State Evolution of Debris Disks around A Stars | journal=The Astrophysical Journal | date=July 2007 | volume=663 | issue=1 | pages=365–382 | doi=10.1086/518404 | bibcode=2007ApJ...663..365W | arxiv=astro-ph/0703608 }}
4. ^1 2 3 4 {{citation | display-authors=1 | title=The status of Galactic field λ Bootis stars in the post-Hipparcos era | last1=Paunzen | first1=E. | last2=Iliev | first2=I. Kh. | last3=Kamp | first3=I. | last4=Barzova | first4=I. S. | journal=Monthly Notices of the Royal Astronomical Society | volume=336 | issue=3 | pages=1030–1042 | date=November 2002 | doi=10.1046/j.1365-8711.2002.05865.x | bibcode=2002MNRAS.336.1030P | arxiv=astro-ph/0207488 | postscript=. }}
5. ^1 2 {{citation | display-authors=1 | last1=Paunzen | first1=E. | last2=Duffee | first2=B. | last3=Heiter | first3=U. | last4=Kuschnig | first4=R. | last5=Weiss | first5=W. W. | title=A spectroscopic survey for λ Bootis stars. II. The observational data | journal=Astronomy and Astrophysics | postscript=. | volume=373 | pages=625–632 | date=July 2001 | doi=10.1051/0004-6361:20010630 | bibcode=2001A&A...373..625P }}
6. ^1 2 3 4 5 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | arxiv=1108.4971 | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | postscript=. }}
7. ^1 2 3 {{citation | title=General catalogue of variable stars: Version GCVS 5.1 | last1=Samus' | first1=N. N. | last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V. | last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N. | journal=Astronomy Reports | volume=61 | issue=1 | pages=80 | year=2017 | postscript=. | doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S }}
8. ^1 2 {{citation | display-authors=1 | last=Murphy | first=Simon J. | last2=Corbally | first2=Christopher J. | last3=Gray | first3=Richard O. | last4=Cheng | first4=Kwang-Ping | last5=Neff | first5=James E. | last6=Koen | first6=Chris | last7=Kuehn | first7=Charles A. | last8=Newsome | first8=Ian | last9=Riggs | first9=Quinlin | title=An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue | journal=Publications of the Astronomical Society of Australia | date=2015 | language=en | volume=32 | postscript=. | doi=10.1017/pasa.2015.34 | issn=1323-3580 | arxiv=1508.03633 | bibcode=2015PASA...32...36M }}
9. ^1 {{citation | display-authors=1 | last=Dorokhova | first=T. N. | last2=Handler | first2=G. | last3=Dorokhov | first3=N. I. | last4=Rodriguez | first4=E. | last5=Udovichenko | first5=S. N. | title=The pulsating λ Bootis star 15 Andromedae: results from a three-site photometry campaign. | journal=Astronomy and Astrophysics | date=March 2008 | volume=480 | issue=1 | postscript=. | doi=10.1051/0004-6361:20078750 | bibcode=2008A&A...480..187D}}
[1][2][3][4][5][6][7][8][9]
}}External links{{Sky|23|34|37.5||40|14|11|233}}{{Stars of Andromeda}} 11 : A-type giants|A-type main-sequence stars|Delta Scuti variables|Lambda Boötis stars|Andromeda (constellation)|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects|Objects with variable star designations |