View source for H1504+65

{{short description|White dwarf in Ursae Minoris constellation}}
{{notability|astro|date=January 2024}}
{{Starbox begin
| name = H1504+65
}}
{{Starbox observe
| epoch = J2000
| constell = [[Ursa Minor]]
| ra = {{RA|15|02|09.6297}}<ref name="Gaia DR2"/>
| dec = {{DEC|+66|12|19.1461}}<ref name="Gaia DR2"/>
| appmag_v = 15.9
}}
{{Starbox character
| class =
| b-v =
| u-b =
| variable =
}}
{{Starbox astrometry
| radial_v =
| prop_mo_ra = {{val|−6.055|0.128}}<ref name="Gaia DR2"/>
| prop_mo_dec = {{val|8.106|0.112}}<ref name="Gaia DR2"/>
| parallax = 2.0573
| p_error = 0.0591
| parallax_footnote = <ref name="Gaia DR2"/>
| absmag_v =
}}
{{Starbox detail
| mass =
| radius =
| luminosity =
| temperature = 200,000
| metal_fe =
| rotational_velocity =
| age_gyr =
}}
{{Starbox catalog
| names = WD 1501+663
}}
{{Starbox reference
| Simbad = RBS+1455
}}
{{Starbox end}}
'''H1504+65''' is an enigmatic [[peculiar star]] in the constellation [[Ursa Minor]]. With a surface temperature of 200,000 K (360,000°F) and an atmosphere composed of carbon, oxygen and 2% neon, it is the second hottest [[white dwarf]] ever discovered, with only [[RX J0439.8−6809]] being hotter. It is thought to be the stellar core of a post-[[asymptotic giant branch star]], though its composition is unexplainable by current models of [[stellar evolution]].<ref>{{cite journal|last=Werner|first=K.|author2=Rauch, T.|date=2011|title=UV spectroscopy of the hot bare stellar core H1504+65 with the HST Cosmic Origins Spectrograph|journal=Astrophysics and Space Science|volume=335|issue=1|pages=121–24|doi=10.1007/s10509-011-0617-x|bibcode = 2011Ap&SS.335..121W |s2cid=116910726}}</ref>
==References==
{{Reflist|refs=
<ref name="Gaia DR2">{{Cite Gaia DR2|1645296216119116928}}</ref>
}}
{{Ursa Minor}}
{{DEFAULTSORT:H1504+65}}
[[Category:White dwarfs]]
[[Category:Ursa Minor]]
{{whitedwarf-star-stub}}