104 Herculis
{{Short description|Star in the constellation Hercules}}
{{Starbox begin}}
{{Starbox image
| image = 250px
| caption = A visual band light curve for V669 Herculis. The main plot shows the long-term variation (plotted from data published by Tabur et al.) and the inset plot shows the short-term periodic variation (adapted from Adelman and William).
}}
{{Starbox observe
| epoch = J2000
| constell = Hercules
| dec = {{DEC|+31|24|19.2469}}
}}
{{Starbox character
| type = AGB
| u-b =
}}
{{Starbox astrometry
| radial_v = {{Val|−1.19|0.29}}
| parallax = 5.8167
| p_error = 0.1769
}}
{{Starbox detail
| source =
| mass =
| radius = {{Val|85.80|6.65|10.88}}
| temperature = {{Val|3535|24|fmt=commas}}
| luminosity = {{Val|1202.3|42.1|fmt=commas}}
| metal_fe = {{Val|−0.08|0.10}}
| rotational_velocity =
| age_myr =
}}
{{Starbox catalog
| names={{odlist | B=A Her | F=104 Her | V=V669 Her | BD=+31°3199 | FK5=3448 | HD=167006 | HIP=89172 | HR=6815 | SAO=66737 | AAVSO=1808+31B }}
}}
{{Starbox reference
| Simbad=104+Her
}}
{{Starbox end}}
104 Herculis is a solitary variable star located around 560 light years away from the Sun in the northern constellation of Hercules. It has the variable star designation V669 Herculis and the Bayer designation A Herculis, while 104 Herculis is the Flamsteed designation. This object is visible to the naked eye as a dim, red-hued point of light with a baseline apparent visual magnitude of 4.96. It is moving closer to the Earth with a heliocentric radial velocity of −1.2 km/s.
The variability of the brightness of 104 Herculis was announced by Joel Stebbins and Charles Morse Huffer in 1928, based on observations made at Washburn Observatory. It was given its variable star designation in 1977.
This is an aging red giant star on the asymptotic giant branch with a stellar classification of M3 III. It is a semiregular variable with an amplitude of 0.14 in the B-band and pulsation periods of 22.9 and 24.0 days. Having exhausted the hydrogen at its core, the star has expanded to 86 times the Sun's radius. It is radiating 1,202 times the Sun's luminosity from its swollen photosphere at an effective temperature of 3,535 K.
References
{{reflist|refs=
{{cite simbad | title=104 Her | access-date=2019-06-17 }}
{{Cite Gaia DR2|4591092238658088192}}
| last1=Kukarkin | first1=B. V. | last2=Kholopov | first2=P. N. | last3=Fedorovich | first3=V. P.
| last4=Kireyeva | first4=N. N. | last5=Kukarkina | first5=N. P. | last6=Medvedeva | first6=G. I.
| last7=Perova |first7=N. B. | title=62nd Name-List of Variable Stars
| journal=Information Bulletin on Variable Stars | date=March 1977 | volume=1248 | pages=1–25
| bibcode=1977IBVS.1248....1K | url=https://ibvs.konkoly.hu/pub/ibvs/1201/1248.pdf
| access-date=8 December 2024}}
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters | postscript=.
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | arxiv=1108.4971
| doi=10.1134/S1063773712050015 | s2cid=119257644 }}
| last1=Stebbins | first1=Joel | last2=Huffer | first2=C. M.
| title=The Constancy of the Light of Red Stars | journal=Publications of the Washburn Observatory | date=1928
| volume=15 | pages=137–174 | bibcode=1928PWasO..15..137S
| url=https://articles.adsabs.harvard.edu/pdf/1928PWasO..15..137S | access-date=5 December 2024}}
| 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 | doi-access=free | bibcode=2008MNRAS.389..869E
| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}
| display-authors=1 | last1=Prugniel | first1=Ph.
| last2=Vauglin | first2=I. | last3=Koleva | first3=M.
| title=The atmospheric parameters and spectral interpolator for the MILES stars
| journal=Astronomy & Astrophysics
| volume=531 | page=A165 | date=July 2011
| doi=10.1051/0004-6361/201116769 | bibcode=2011A&A...531A.165P
| postscript=. | arxiv=1104.4952 | s2cid=54940439 }}
| last1=Tabur | first1=V. | last2=Bedding | first2=T. R.
| last3=Kiss | first3=L. L. | last4=Moon | first4=T. T.
| last5=Szeidl | first5=B. | last6=Kjeldsen | first6=H.
| title=Long-term photometry and periods for 261 nearby pulsating M giants
| display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society
| volume=400 | issue=4 | pages=1945–1961 | date=December 2009
| doi=10.1111/j.1365-2966.2009.15588.x | doi-access=free | postscript=.
| bibcode=2009MNRAS.400.1945T | arxiv=0908.3228 | s2cid=15358380 }}
| display-authors=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.
| title=General Catalogue of Variable Stars
| version=5.1 | journal=Astronomy Reports
| year=2017 | volume=61 | issue=1 | pages=80–88
| bibcode=2017ARep...61...80S | postscript=.
| doi=10.1134/S1063772917010085 | s2cid=125853869 }}
| title=The Perkins catalog of revised MK types for the cooler stars
| last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C.
| journal=Astrophysical Journal Supplement Series
| volume=71 | pages=245 | year=1989 | postscript=.
| bibcode=1989ApJS...71..245K | doi=10.1086/191373 | s2cid=123149047 }}
| title=BVRI Photometry of nz Gem, HD 73017, HD 77247, RT Vir and 104 Her
| last1=Adelman | first1=Saul J. | last2=Harrell | first2=William L.
| journal=Baltic Astronomy | postscript=.
| volume=15 | pages=363–381 | year=2006
| bibcode=2006BaltA..15..363A }}
| last1=Glass | first1=I. S. | last2=Van Leeuwen | first2=F.
| title=Semiregular variables in the solar neighbourhood
| journal=Monthly Notices of the Royal Astronomical Society
| volume=378 | issue=4 | pages=1543–1549 | year=2007
| bibcode=2007MNRAS.378.1543G | arxiv=0704.3150
| doi=10.1111/j.1365-2966.2007.11903.x | doi-access=free | s2cid=14332208 | postscript=. }}
| last1=Eggen | first1=Olin J.
| title=Asymptotic giant branch stars near the sun
| journal=Astronomical Journal | postscript=.
| volume=104 | issue=1 | pages=275–313 | date=July 1992
| doi=10.1086/116239 | bibcode=1992AJ....104..275E }}
}}
{{Stars of Hercules}}
{{DEFAULTSORT:104 Herculis}}
Category:Semiregular variable stars
Category:Hercules (constellation)