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V Hya ( = IRC -20218, RAFGL 1439 , SAO 179278, IRAS 10491-2059, SIMBAD
entry)
Basic parameters
Distance = 0.33 (Loup et al., 1993A&AS...99..291L)
V_LSR = -17.0 km/s(Loup et al., 1993A&AS...99..291L)
Vexp = 15.8 km/s (Loup et al., 1993A&AS...99..291L)
Molecular observations
- (Loup et al., 1993A&AS...99..291L)
They compiled some basic data and literature information for circumstellar envelopes. The information for V Hya is:
Distance = 0.33 kpc,
CO 1-0: Vlsr = -14 km/s, Vexp = 20.9 km/s, Tmb = 0.22 K, Iint = 5.40 K.km/s, rms = 0.120 K, telescope = BTL
CO 1-0: Vlsr = -16 km/s, Vexp = 14.2 km/s, Tmb = 0.56 K, Iint = , rms = , telescope = NRAO
CO 1-0: Vlsr = -17 km/s, Vexp = km/s, T* = K, Iint = K.km/s, rms = , telescope = IRAM
CO 1-0: Vlsr = -16 km/s, Vexp = 15.8 km/s, Tmb = 1.40 K, Iint = 24.50 K.km/s, rms = K, telescope = SEST
CO 1-0: Vlsr = -17 km/s, Vexp = 13.7 km/s, T* = K, Iint = 50.70 K.km/s, rms = K, telescope = IRAM
CO 1-0: Vlsr = -17 km/s, Vexp = 26.4 km/s, Tmb = 0.60 K, Iint = , rms = , telescope = NRAO
CO 1-0: Vlsr = -16 km/s, Vexp = 15.8 km/s, Tmb = 1.40 K, Iint = 24.60 K.km/s, rms = 0.050 K, telescope = SEST
CO 2-1: Vlsr = -17 km/s, Vexp = 24.0 km/s, Tmb = 1.40 K, Iint = , rms = , telescope = NRAO
HCN 1-0: Vlsr = -18 km/s, Vexp = km/s, Tmb = 0.08K, Iint = 1.70 K.km/s, rms = K, telescope = SEST
- (Dehaes et al., 2007MNRAS.377..931D)
They surveyed 1.2mm continuum of a sample of AGB stars to investigate the AGB mass loss rate evolution from SED modeling. The measured value for V Hya is F1.2mm = 99.5 ± 6.6 mJy. They fitted the SED of AFGL 3068 with following parameters: Av=0.16 ± 0.15, Tau(0.5um) = 3 ± 2, Teff = 2500K, Td(Rmin) = 700 ± 200 K, dust: AMC. As a result, they also determined other quantities of AFGL 3068 as: L* = 9780 Lsun, Mlr = 4.72x 10^-6 Msun/yr, Ve = 13.0 km/s, Rmin = 6.65 x 10^14 cm, Rmin/R* = 18.1.
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