LL Pegasi

LL Pegasi

LL Pegasi is continuously losing gaseous material as it evolves into a planetary nebula.[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pegasus
Right ascension 23h 19m 12.607s[2]
Declination +17° 11′ 33.13″[2]
Characteristics
Evolutionary stage Asymptotic giant branch[3]
Spectral type C[4]
Variable type Mira[5]
Astrometry
Distance1,300[3] pc
Details
Radius1,074[6] R☉
Luminosity10,900[6] L☉
Temperature1,800[6] K
Other designations
LL Pegasi, IRAS 23166+1655, 2MASS J23191260+1711331, RAFGL 3068
Database references
SIMBADdata

LL Pegasi (AFGL 3068) is a Mira variable star surrounded by a pinwheel-shaped nebula, IRAS 23166+1655, thought to be a preplanetary nebula. It is a binary system that includes an extreme carbon star. The pair is hidden by the dust cloud ejected from the carbon star and is only visible in infrared light.[7]

  1. ^ Cite error: The named reference ALMAImage was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference 2mass was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference lombaert was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference groenewegen was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  6. ^ a b c Massalkhi, S.; Agúndez, M.; Cernicharo, J. (August 2019). "Study of CS, SiO, and SiS abundances in carbon star envelopes: Assessing their role as gas-phase precursors of dust". Astronomy & Astrophysics. 628: A62. arXiv:1906.09461. Bibcode:2019A&A...628A..62M. doi:10.1051/0004-6361/201935069. ISSN 0004-6361. PMC 6739229. PMID 31511746.
  7. ^ Cite error: The named reference morris was invoked but never defined (see the help page).