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{{Starbox begin |
{{Starbox begin
name=TT Aquilae }}
| name=TT Aquilae
}}
{{Starbox observe |
{{Starbox observe
epoch=J2000 |
| epoch=J2000
| ra={{RA|19|08|13.75081}}<ref name=hipparcos/>
ra={{RA|19|08|13.75}}<ref name=SIMBAD>{{cite web | title = TT Aquilae - Classical Cepheid (delta Cep type) | work = SIMBAD Astronomical Database | publisher = Centre de Données astronomiques de Strasbourg | url =http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+178359 | accessdate = 29 June 2014 }}</ref> |
dec={{DEC|+01|17|55.15}}<ref name=SIMBAD/> |
| dec={{DEC|+01|17|55.1600}}<ref name=hipparcos/>
appmag_v=6.46-7.7<ref name=AAVSOTT/> |
| appmag_v=6.52 - 7.65<ref name=gcvs/>
constell=[[Aquila (constellation)|Aquila]] }}
| constell=[[Aquila (constellation)|Aquila]]
}}
{{Starbox character |
{{Starbox character
class=F6-G5<ref name=AAVSOTT/> |
| class=G0/2Ib<ref name=houk/> {{nowrap|(F6-G5<ref name=gcvs/>)}}
r-i = |
| r-i =
v-r = |
| v-r =
b-v = 1.27 ± 0.02 |
| b-v = +0.932 - +1.637<ref name=berdnikov/>
| u-b = +0.638 - +1.601<ref name=berdnikov/>
u-b = |
variable=[[Cepheid variable]]<ref name=SIMBAD/> }}
| variable=[[Classical Cepheid variable|δ Cep]]<ref name=gcvs/>
}}
{{Starbox astrometry |
{{Starbox astrometry
radial_v=0 |
| radial_v=3.00<ref name=rv/>
prop_mo_ra=-0.35 |
| prop_mo_ra=+1.17<ref name=hipparcos/>
prop_mo_dec=-4.47 |
| prop_mo_dec=&minus;3.33<ref name=hipparcos/>
parallax=0.41 |
| parallax=0.18
p_error=0.96 |
| p_error=1.26
| parallax_footnote=<ref name=hipparcos/>
absmag_v= }}
| absmag_v=&minus;4.26<ref name=kovtyukh/>
⚫
{{Starbox detail|
}}
⚫
mass= |
⚫
{{Starbox detail
radius= |
⚫
| mass=
⚫
luminosity= |
| radius=83.8 - 100.5<ref name=imbert/>
temperature=6,000–7,500 |
⚫
| luminosity=
⚫
metal= |
| temperature=5,007 - 5,630<ref name=kovtyukh/> {{nowrap|(- 6,200<ref name=kovtyukhIV/>)}}
⚫
rotation= |
⚫
| metal=+0.10
⚫
age= }}
| gravity=1.10 - 1.70
⚫
{{Starbox catalog |
⚫
| rotation=
⚫
names=[[Henry Draper Catalogue|HD]] 178359, [[Durchmusterung|BD]]+01° 3899, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 124305. }}
⚫
| age=
⚫
{{Starbox reference |
}}
⚫
Simbad=HD+178359
⚫
{{Starbox catalog
⚫
| ARICNS = }}
⚫
| names=[[variable star designation|TT]]&nbsp;Aql, [[Henry Draper Catalogue|HD]]&nbsp;178359, [[Hipparcos|HIP]]&nbsp;93390, [[Durchmusterung|BD]]+01°3899, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;124305
}}
⚫
{{Starbox reference
⚫
| Simbad=HD+178359
⚫
| ARICNS =
}}
{{starbox sources|HIP|CCDM|HR}}
{{starbox sources|HIP|CCDM|HR}}
{{Starbox end}}
{{Starbox end}}


'''TT Aquilae''' (TT Aql) is a [[Classical Cepheid variable|Classical Cepheid (δ Cep)]] [[variable star]] in the [[constellation]] [[Aquila (constellation)|Aquila]].
'''TT Aquilae''' is a [[star]] in the [[constellation]] [[Aquila (constellation)|Aquila]]. A [[Cepheid variable]], its [[apparent magnitude]] ranges from 6.46 to 7.7 over 13.7546 days.<ref name=AAVSOTT>{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=1166 |title=TT Aquilae |author=Watson, Christopher |date=4 January 2010 |work=AAVSO Website|publisher=American Association of Variable Star Observers|accessdate=12 March 2014}}</ref> It is a yellow-white supergiant that pulsates between spectral types F6 and G5.<ref name=AAVSOTT/>

The visual [[apparent magnitude]] of TT Aql ranges from 6.52 to 7.65 over 13.7546 days.<ref name=gcvs/> The light curve is asymmetric, taking only 35% of the total period to rise from minimum to maximum.<ref name=sachkov/>

TT Aql is a yellow-white supergiant around four thousand times brighter than the sun. It pulsates and varies in temperature between about 5,000 K and 6,000 K,<ref name=kovtyukhIV/> and the spectral type varies between F6 and G5. The radius is {{solar radius|91.4}} at maximum brightness, varying between {{solar radius|84}} and {{solar radius|100}} as the star pulsates.<ref name=imbert/>


== References ==
== References ==
{{reflist}}
{{reflist|refs=


<ref name=imbert>{{cite journal|bibcode=1999A&AS..140...79I|title=Détermination des rayons de Céphéides. V. Vitesses radiales et dimensions de 22 Céphéides galactiques. Determination of the radii of Cepheids V. Radial velocities and dimensions of 22 galactic Cepheids|journal=Astronomy and Astrophysics Supplement|volume=140|pages=79|author1=Imbert|first1=M.|year=1999|doi=10.1051/aas:1999515}}</ref>
* {{cite journal|last1=Landis|first1=Howard J.|title=Photoelectric Light Curves for T Monocerotis and TT Aquilae|journal=Journal of the American Association of Variable Star Observers |date=1 June 1976|volume=4|pages=84–85|bibcode=1976JAVSO...4...84L}}

<ref name=hipparcos>{{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|author1=Van Leeuwen|first1=F.|year=2007|doi=10.1051/0004-6361:20078357|arxiv = 0708.1752 }}</ref>

<ref name=gcvs>{{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|display-authors=etal|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>

<ref name=rv>{{cite journal|bibcode=2006AstL...32..759G|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|journal=Astronomy Letters|volume=32|issue=11|pages=759|author1=Gontcharov|first1=G. A.|year=2006|doi=10.1134/S1063773706110065}}</ref>

<ref name=houk>{{cite journal|bibcode=1999MSS...C05....0H|title=Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5|journal=Michigan Spectral Survey|volume=05|pages=0|author1=Houk|first1=N.|last2=Swift|first2=C.|year=1999}}</ref>

<ref name=sachkov>{{cite journal|bibcode=2002PAZh...28..653S}}</ref>

<ref name=kovtyukh>{{cite journal|bibcode=2005AJ....129..433K|title=Phase-dependent Variation of the Fundamental Parameters of Cepheids. II. Periods Longer than 10 Days|journal=The Astronomical Journal|volume=129|pages=433|author1=Kovtyukh|first1=V. V.|last2=Andrievsky|first2=S. M.|last3=Belik|first3=S. I.|last4=Luck|first4=R. E.|year=2005|doi=10.1086/426339}}</ref>

<ref name=kovtyukhIV>{{cite journal|bibcode=2008AJ....136...98L|title=Phase-Dependent Variation of the Fundamental Parameters of Cepheids. Iv. S-CEPHEIDS|journal=The Astronomical Journal|volume=136|pages=98|author1=Luck|first1=R. E.|last2=Andrievsky|first2=S. M.|last3=Fokin|first3=A.|last4=Kovtyukh|first4=V. V.|year=2008|doi=10.1088/0004-6256/136/1/98}}</ref>

<ref name=berdnikov>{{cite journal|bibcode=2008yCat.2285....0B|title=VizieR Online Data Catalog: Photoelectric observations of Cepheids in UBV(RI)c (Berdnikov, 2008)|journal=VizieR On-line Data Catalog: II/285. Originally published in: 2008yCat.2285....0B|volume=2285|author1=Berdnikov|first1=L. N.|year=2008}}</ref>

}}

==External links==
[http://sdc.cab.inta-csic.es/omc/var/0463000019.html INTEGRAL-OMC catalogue]


{{Stars of Aquila}}
{{Stars of Aquila}}
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[[Category:Objects named with variable star designations|Aquilae, TT]]
[[Category:Objects named with variable star designations|Aquilae, TT]]
[[Category:F-type supergiants]]
[[Category:F-type supergiants]]

{{supergiant-star-stub}}
{{var-star-stub}}

Revision as of 20:14, 31 July 2016

TT Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 08m 13.75081s[1]
Declination +01° 17′ 55.1600″[1]
Apparent magnitude (V) 6.52 - 7.65[2]
Characteristics
Spectral type G0/2Ib[3] (F6-G5[2])
U−B color index +0.638 - +1.601[4]
B−V color index +0.932 - +1.637[4]
Variable type δ Cep[2]
Astrometry
Radial velocity (Rv)3.00[5] km/s
Proper motion (μ) RA: +1.17[1] mas/yr
Dec.: −3.33[1] mas/yr
Parallax (π)0.18 ± 1.26 mas[1]
Absolute magnitude (MV)−4.26[6]
Details
Radius83.8 - 100.5[7] R☉
Surface gravity (log g)1.10 - 1.70 cgs
Temperature5,007 - 5,630[6] (- 6,200[8]) K
Metallicity+0.10
Other designations
TT Aql, HD 178359, HIP 93390, BD+01°3899, SAO 124305
Database references
SIMBADdata
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

TT Aquilae (TT Aql) is a Classical Cepheid (δ Cep) variable star in the constellation Aquila.

The visual apparent magnitude of TT Aql ranges from 6.52 to 7.65 over 13.7546 days.[2] The light curve is asymmetric, taking only 35% of the total period to rise from minimum to maximum.[9]

TT Aql is a yellow-white supergiant around four thousand times brighter than the sun. It pulsates and varies in temperature between about 5,000 K and 6,000 K,[8] and the spectral type varies between F6 and G5. The radius is 91.4 R☉ at maximum brightness, varying between 84 R☉ and 100 R☉ as the star pulsates.[7]

References

  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ^ a b c d Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  3. ^ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 05: 0. Bibcode:1999MSS...C05....0H.
  4. ^ a b Berdnikov, L. N. (2008). "VizieR Online Data Catalog: Photoelectric observations of Cepheids in UBV(RI)c (Berdnikov, 2008)". VizieR On-line Data Catalog: II/285. Originally published in: 2008yCat.2285....0B. 2285. Bibcode:2008yCat.2285....0B.
  5. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. ^ a b Kovtyukh, V. V.; Andrievsky, S. M.; Belik, S. I.; Luck, R. E. (2005). "Phase-dependent Variation of the Fundamental Parameters of Cepheids. II. Periods Longer than 10 Days". The Astronomical Journal. 129: 433. Bibcode:2005AJ....129..433K. doi:10.1086/426339.
  7. ^ a b Imbert, M. (1999). "Détermination des rayons de Céphéides. V. Vitesses radiales et dimensions de 22 Céphéides galactiques. Determination of the radii of Cepheids V. Radial velocities and dimensions of 22 galactic Cepheids". Astronomy and Astrophysics Supplement. 140: 79. Bibcode:1999A&AS..140...79I. doi:10.1051/aas:1999515.
  8. ^ a b Luck, R. E.; Andrievsky, S. M.; Fokin, A.; Kovtyukh, V. V. (2008). "Phase-Dependent Variation of the Fundamental Parameters of Cepheids. Iv. S-CEPHEIDS". The Astronomical Journal. 136: 98. Bibcode:2008AJ....136...98L. doi:10.1088/0004-6256/136/1/98.
  9. ^ . Bibcode:2002PAZh...28..653S. {{cite journal}}: Cite journal requires |journal= (help); Missing or empty |title= (help)

External links

INTEGRAL-OMC catalogue

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