| 释义 |
- References
{{Starbox begin
| name = 4 Aquilae
}}{{Starbox observe
| epoch = J2000
| constell = Aquila
| ra = {{RA|18|44|49.93813}}[1]
| dec = {{DEC|+02|03|36.1381}}[1]
| appmag_v = 5.02[3]
}}{{Starbox character
| type =
| class = B9 V[4]
| b-v = {{Val|−0.055|0.016}}[3]
| u-b =
| variable =
}}{{Starbox astrometry
| radial_v = {{Val|−13.0|4.2}}[6]
| prop_mo_ra = +9.347[1]
| prop_mo_dec = −14.719[1]
| parallax = 6.7299
| p_error = 0.2433
| parallax_footnote = [1]
| absmag_v = −0.75[3]
}}{{Starbox detail
| source =
| mass = {{Val|3.60|0.06}}[11]
| radius = 3.00[12]
| luminosity = {{Val|294|20.4|20.9}}[11]
| temperature = {{Val|10965|50|51|fmt=commas}}[11]
| metal_fe =
| gravity = {{Val|3.46|0.10}}[15]
| rotational_velocity = 259[11]
| age_myr =
}}{{Starbox catalog
| names = {{odlist | F=4 Aql | BD=+01° 3766 | HD=173370 | HIP=91975 | HR=7040 | SAO=123879 | AG=+02 2306 | GC=25652 }}
}}{{Starbox reference
| Simbad = 4+Aql
}}{{Starbox end}}4 Aquilae, abbreviated 4 Aql, is a single,[18] white-hued star in the equatorial constellation of Aquila. 4 Aquilae is the Flamsteed designation. It has an apparent visual magnitude of 5.02,[3] making it a faint star visible to the naked eye. The distance to 4 Aql can be estimated from its annual parallax shift of {{Val|6.7|ul=mas}},[1] yielding an estimated range of around 480 light years. It is moving closer to the Earth with a heliocentric radial velocity of −13 km/s.[6]This is a B-type main-sequence star with a stellar classification of B9 V.[4] It was classed as a Be star by Arne Sletteback in 1982, indicating it has ionized circumstellar gas.[12] The star is spinning rapidly, showing a projected rotational velocity of 259 km/s,[11] and is being viewed almost equator-on.[15] It has 3.6[11] times the mass of the Sun and 3[12] times the Sun's radius. The star is radiating 294[11] times the Sun's luminosity from its photosphere at an effective temperature of 10,965 K.[11] References1. ^1 2 3 4 5 6 {{cite DR2}}
2. ^1 2 3 4 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }}
3. ^1 2 3 4 5 6 7 8 {{citation | title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities | last1=Zorec | first1=J. | last2=Royer | first2=F. | journal=Astronomy & Astrophysics | volume=537 | pages=A120 | year=2012 | doi=10.1051/0004-6361/201117691 | bibcode=2012A&A...537A.120Z | arxiv=1201.2052 | postscript=. }}
4. ^1 2 {{citation | last1=Lefever | first1=K. | last2=Puls | first2=J. | last3=Morel | first3=T. | last4=Aerts | first4=C. | last5=Decin | first5=L. | last6=Briquet | first6=M. | title=Spectroscopic determination of the fundamental parameters of 66 B-type stars in the field-of-view of the CoRoT satellite | journal=Astronomy and Astrophysics | display-authors=1 | volume=515 | page=A74 |date=June 2010 | bibcode=2010A&A...515A..74L | arxiv=0910.2851 | doi=10.1051/0004-6361/200911956 | postscript=. }}
5. ^1 {{citation| last1=Chini | first1=R. | last2=Hoffmeister | first2=V. H.| last3=Nasseri | first3=A.| last4=Stahl | first4=O.| last5=Zinnecker | first5=H. | display-authors=1| title=A spectroscopic survey on the multiplicity of high-mass stars| journal=Monthly Notices of the Royal Astronomical Society| volume=424 | issue=3 | pages=1925–1929 | year=2012| bibcode=2012MNRAS.424.1925C | arxiv=1205.5238| doi=10.1111/j.1365-2966.2012.21317.x | postscript=. }}
6. ^1 2 {{citation | last1=Gontcharov | first1=G. A. | title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system | journal=Astronomy Letters | volume=32 | issue=11 | pages=759–771 | date=November 2006 | bibcode=2006AstL...32..759G | arxiv=1606.08053 | doi=10.1134/S1063773706110065 | postscript=. }}
7. ^1 2 {{citation | last1=Houk | first1=N. | last2=Swift | first2=C. | title=Michigan catalogue of two-dimensional spectral types for the HD Stars | journal=Michigan Spectral Survey | volume=5 | year=1999 | postscript=. | bibcode=1999MSS...C05....0H }}
8. ^1 2 3 {{citation | title=The Hα Profiles of Be Shell Stars | last1=Silaj | first1=J. | last2=Jones | first2=C. E. | last3=Sigut | first3=T. A. A. | last4=Tycner | first4=C. | display-authors=1 | journal=The Astrophysical Journal | volume=795 | issue=1 | id=82 | pages=12 | date=November 2014 | doi=10.1088/0004-637X/795/1/82 | bibcode=2014ApJ...795...82S | postscript=. }}
}}{{Stars of Aquila}} 8 : B-type main-sequence stars|Be stars|Aquila (constellation)|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |