17 Lyrae

{{Starbox begin

| name=17 Lyrae AB

}}

{{Starbox image

| image=

{{Location mark

|image=Lyra constellation map.svg|alt=|float=center|width=240

|label=|position=right

|mark=Red circle.svg|mark_width=8|mark_link=17 Lyr

|x=283|y=904

}}

|caption=Location of 17 Lyrae (circled)

}}

{{Starbox observe 3s

| epoch=J2000.0

| constell=Lyra

| component1 = AB

| ra1={{RA|19|07|25.58012}}

| dec1={{DEC|+32|30|6.2599}}

| appmag_v1=5.221

| component2 = A

| ra2={{RA|19|07|25.58}}

| dec2={{DEC|+32|30|06.3}}

| appmag_v2=5.26

| component3 = B

| ra3={{RA|19|07|25.31}}

| dec3={{DEC|+32|30|07.5}}

| appmag_v3=9.1

}}

{{Starbox character

| class=F0V

| b-v=+0.351

| u-b=+0.044

}}

{{Starbox astrometry

| component1 = A

| prop_mo_ra=+114.276

| prop_mo_dec=+18.316

| parallax=22.8557

| p_error=0.0782

| parallax_footnote=

| absmag_v=

| component2 = B

| prop_mo_ra2=+120.597

| prop_mo_dec2=+9.110

| parallax2=22.8407

| p_error2=0.0190

| parallax_footnote2=

| absmag_v2=

}}

{{Starbox orbit

| reference =

| primary = A

| period_unitless = 42.857 days

| eccentricity = 0.0

| k1 = 13.10

}}

{{Starbox detail

| component1 = A

| mass = 1.6

| temperature = 6,887

| luminosity = 16.4

| radius = 2.5

| metal_fe = 0.0

| rotational_velocity = 138

| gravity = 3.57

| age_gyr = 1.4

| component2 = B

| mass2 = 0.73

| temperature2 = 5,266

| luminosity2 =

| radius2 =

| metal_fe2 = −0.46

| rotational_velocity2 =

| gravity2 = 4.61

| age_gyr2 =

}}

{{Starbox catalog

| names=17 Lyrae, HR 7261, BD+32°3326, HD 178449, SAO 67835, HIP 93917, GC 26340, CCDM J19075+3231, IDS 19036+3221

}}

{{Starbox reference

| Simbad=17+Lyrae

}}

17 Lyrae is a multiple star system in the constellation Lyra, 143 light years away from Earth.

Components

The 17 Lyrae system contains two visible components, designated A and B, separated by 2.48" in 1997. The primary star is a single-lined spectroscopic binary with a period of 42.9 days.

There was once thought to be a fourth star in the system, the red dwarf binary Kuiper 90, designated 17 Lyrae C, until it was evident that the star's parallax and proper motions were too different for it to be part of the system. The separation between 17 Lyrae AB and C is increasing rapidly, from less than 2' in 1881 to nearly 5' in 2014.

A number of other visual companions have been catalogued. The closest is the 11th magnitude star at 39", and the brightest is BD+32 3325 just over 2' away.

Properties

The primary component, 17 Lyrae A, is a 5th magnitude main sequence star of the spectral type F0, meaning it has a surface temperature of about 6,750 K. It is about 60% more massive than the sun and 16 times more luminous. It has been catalogued as an Am star but is now believed to be a relatively normal quickly-rotating star.

The visible companion 17 Lyrae B is a 9th magnitude star of an unknown spectral type. The spectroscopic companion cannot be detected in the spectrum and its properties are uncertain. Faint sharp spectral lines contrasting with the broadened lines of the primary may originate in a shell of material around the stars.

References

{{Reflist|refs=

{{cite journal |bibcode=2022yCat.1354....0A |title=VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022) |last1=Anders |first1=F. |last2=Khalatyan |first2=A. |last3=Queiroz |first3=A. B. A. |last4=Chiappini |first4=C. |last5=Ardevol |first5=J. |last6=Casamiquela |first6=L. |last7=Figueras |first7=F. |last8=Jimenez-Arranz |first8=O. |last9=Jordi |first9=C. |last10=Monguio |first10=M. |last11=Romero-Gomez |first11=M. |last12=Altamirano |first12=D. |last13=Antoja |first13=T. |last14=Assaad |first14=R. |last15=Cantat-Gaudin |first15=T. |last16=Castro-Ginard |first16=A. |last17=Enke |first17=H. |last18=Girardi |first18=L. |last19=Guiglion |first19=G. |last20=Khan |first20=S. |last21=Luri |first21=X. |last22=Miglio |first22=A. |last23=Minchev |first23=I. |last24=Ramos |first24=P. |last25=Santiago |first25=B. X. |last26=Steinmetz |first26=M. |journal=Vizier Online Data Catalog |year=2022 }}

{{cite journal|bibcode=2003MNRAS.346...27B|title=Abundance analysis of Am binaries and search for tidally driven abundance anomalies - I. HD 33254, HD 178449 and HD 198391|journal=Monthly Notices of the Royal Astronomical Society|volume=346|pages=27–36|last1=Budaj|first1=J|last2=Iliev|first2=I. Kh|year=2003|issue=1|doi=10.1046/j.1365-2966.2003.07071.x|doi-access=free}}

{{cite journal | author=Slocum, Frederick | title=The parallax of 17 Lyrae C (abstract) | journal=Popular Astronomy | year=1929 | volume=37 | pages=328 | bibcode=1929PA.....37..328S }}

{{cite journal|bibcode= 2007A&A...474..653V |title= Validation of the new Hipparcos reduction |journal= Astronomy and Astrophysics |volume= 474 |issue= 2 |pages= 653–664 |last1= Van Leeuwen |first1= F |year= 2007 |doi= 10.1051/0004-6361:20078357 |arxiv= 0708.1752 |s2cid= 18759600 }}

{{cite journal|bibcode=2000A&A...355L..27H|title=The Tycho-2 catalogue of the 2.5 million brightest stars|journal=Astronomy and Astrophysics|volume=355|pages=L27|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|year=2000}}

{{cite web|url=http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5a1ef5de113c&-out.add=.&-source=I/274/ccdm&recno=85112|title=CCDM Vizier entry|access-date=2017-11-29}}

{{cite web|url=http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5a1ef5de113c&-out.add=.&-source=I/274/ccdm&recno=85113|title=CCDM Vizier entry|access-date=2017-11-29}}

{{cite journal|bibcode= 1974PASP...86...70C |title= MK Spectral Types for Some Bright F Stars |journal= Publications of the Astronomical Society of the Pacific |volume= 86 |pages= 70 |last1= Cowley |first1= Anne |last2= Fraquelli |first2= Dorothy |year= 1974 |issue= 509 |doi= 10.1086/129562 |doi-access= free }}

{{cite journal|bibcode=2011A&A...525A..26D|title=The mass ratio and initial mass functions in spectroscopic binaries|journal=Astronomy and Astrophysics|volume=525|pages=A26|last1=Ducati|first1=J. R|last2=Penteado|first2=E. M|last3=Turcati|first3=R|year=2011|doi=10.1051/0004-6361/200913895|doi-access=free|hdl=10183/99264|hdl-access=free}}

{{cite journal|bibcode=2007ApJ...658.1289T|arxiv=astro-ph/0612029|title=Debris disks in main-sequence binary systems|journal=The Astrophysical Journal|volume=658|issue=2|pages=1289–1311|last1=Trilling|first1=D. E|last2=Stansberry|first2=J. A|last3=Stapelfeldt|first3=K. R|last4=Rieke|first4=G. H|last5=Su|first5=K. Y. L|last6=Gray|first6=R. O|last7=Corbally|first7=C. J|last8=Bryden|first8=G|last9=Chen|first9=C. H|last10=Boden|first10=A|last11=Beichman|first11=C. A|year=2007|doi=10.1086/511668|s2cid=14867168}}

{{cite journal|bibcode=2012A&A...537A.120Z|title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities|journal=Astronomy & Astrophysics|volume=537|pages=A120|last1=Zorec|first1=J|last2=Royer|first2=F|year=2012|doi=10.1051/0004-6361/201117691|arxiv=1201.2052|s2cid=55586789}}

{{cite journal|bibcode=2001AJ....122.3466M|title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog|journal=The Astronomical Journal|volume=122|issue=6|pages=3466|last1=Mason|first1=Brian D|last2=Wycoff|first2=Gary L|last3=Hartkopf|first3=William I|last4=Douglass|first4=Geoffrey G|last5=Worley|first5=Charles E|year=2001|doi=10.1086/323920|doi-access=free}}

}}

External links

[http://casanchi.org/ast/kui90.pdf Study of 17 Lyrae (in Spanish)]
[http://homepage.univie.ac.at/peter.wienerroither/pwafods/19074+3230.htm 17 Lyrae in color] {{Webarchive|url=https://web.archive.org/web/20091130014433/http://homepage.univie.ac.at/peter.wienerroither/pwafods/19074+3230.htm |date=2009-11-30 }}

Category:Spectroscopic binaries

Category:F-type main-sequence stars

7261

Category:Durchmusterung objects

Category:Am stars