HE 1219-0312

HE 1219-0312

Observation data Epoch J2000      Equinox J2000
Constellation	Virgo
Right ascension	12^h 21^m 34.143^s[1]
Declination	−03° 28′ 39.64″[1]
Apparent magnitude (V)	15.94[2]
Characteristics
Evolutionary stage	Metal-poor star^[citation needed]
Spectral type	CEMP^[citation needed]
Astrometry
Proper motion (μ)	RA: −2.817[1] mas/yr Dec.: −8.763[1] mas/yr
Parallax (π)	0.0893 ± 0.042 mas[1]
Distance	approx. 40,000 ly (approx. 11,000 pc)
Details
Mass	0.8[3] M☉
Radius	2.5[1] R☉
Luminosity	6.3[1] L☉
Surface gravity (log g)	2.05[3] cgs
Temperature	5,100[3] K
Metallicity [Fe/H]	−2.96[4] dex
Age	13.6[3] Gyr
Other designations
HE 1219-0312, 2MASS J12213413-0328396
Database references
SIMBAD	data

HE 1219-0312 is an extremely metal-poor star in the constellation Virgo, The star is located at around 41,400 light years away from earth.[1]

It is thought to be a second generation, Population II or metal-poor star ([Fe/H] = -2.96), The star was found in the sample of extremely metal-poor halo stars from the Hamburg/ESO Survey by W. Hayek and collaborators. The group's research was published in the July 2, 2009 issue of The Astrophysical Journal.[4]

If the age of the star HE 1219-0312 was confirmed at 17.6 billion years, that this star will be the oldest star in the universe.[4]

Elemental abundance

The abundance of two strongly r-process enhanced in two metal-poor stars, BPS CS29491-0069 and HE 1219-0312 was detected by HERES project, which there was ([Fe/H] = -2.51, [r/Fe] = +1.1) and ([Fe/H] = -2.96, [r/Fe] = +1.5).[4]

the analysis based on high-quality VLT/UVES spectra and MARCS model atmosphere was detected these eighteen heavy elements in the spectrum of HE 1219–0312 with an case of Th II 4019A line.[4]

Radioactive dating for HE 1219–0312 with the observed thorium and rare-earth elements abundance pairs results in an average age of 9.5 billion years, when based on solar r-process residuals, that Age of the star HE 1219-0312 was 17.6 billion years, so, we puts the age of HE 1219-0312 into 13.6 billion years to avoid to exceed the universe's age.[4]

See also

• HD 140283
• HE 0107-5240
• HE 1523-0901

References

1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. Beers, Timothy C.; Flynn, Chris; Rossi, Silvia; Sommer-Larsen, Jesper; Wilhelm, Ronald; Marsteller, Brian; Lee, Young Sun; De Lee, Nathan; Krugler, Julie; Deliyannis, Constantine P.; Simmons, Andrew T.; Mills, Elisabeth; Zickgraf, Franz-Josef; Holmberg, Johan; Önehag, Anna; Eriksson, Anders; Terndrup, Donald M.; Salim, Samir; Andersen, Johannes; Nordström, Birgitta; Christlieb, Norbert; Frebel, Anna; Rhee, Jaehyon (2007). "Broadband UBVR_CI_C Photometry of Horizontal-Branch and Metal-poor Candidates from the HK and Hamburg/ESO Surveys. I.". The Astrophysical Journal Supplement Series. 168 (1): 128. arXiv:astro-ph/0610018. Bibcode:2007ApJS..168..128B. doi:10.1086/509324. S2CID 119500060.
3. Reggiani, Henrique; Ji, Alexander P.; Schlaufman, Kevin C.; Frebel, Anna; Necib, Lina; Nelson, Tyler; Hawkins, Keith; Galarza, Jhon Yana (2022). "The Chemical Composition of Extreme-velocity Stars". The Astronomical Journal. 163 (6): 252. arXiv:2203.16364. Bibcode:2022AJ....163..252R. doi:10.3847/1538-3881/ac62d9. S2CID 247793231.
4. Kratz, Hayek; Pfeiffer, Wiesendahl (2009). "The Hamburg/ESO R-process enhanced star survey (HERES). IV. Detailed abundance analysis and age dating of the strongly r-process enhanced stars CS 29491-069 and HE 1219-0312". The Astronomical Journal. 504 (2): 524. arXiv:0910.0707. Bibcode:2009A&A...514..511H. doi:10.1051/0004-6361/200811121. S2CID 49573181.