Dust and molecular shells in asymptotic giant branch stars - Mid-infrared interferometric observations of R Aquilae, R Aquarii, R Hydrae, W Hydrae, and V Hydrae

Home

All issues

Volume 545 (September 2012)

A&A, 545 (2012) A56

Full HTML

Free Access

Table 1

Target properties and phenomenology.

Target name:	R Aql	R Aqr	R Hya	W Hya	V Hya
	HIP 93820	HIP 117054	HIP 65835	HIP 67419	HIP 53085
Associated calibrator^a:	η Sgr, ϵ Peg	30 Psc	2 Cen	2 Cen	α Hya


Type:	Mira	Mira	Mira	Mira/SRa	SRa/L
Chemistry:	O-rich	O-rich	O-rich	O-rich	C-rich
Mass^b (M_⊙):	1.0	1.5	2.0	1.0	1.0
Distance^c (pc):		250 ± 50	130 ± 25		360 ± 70
12 μm flux^d (Jy):	402 ± 36	1580 ± 60	1590 ± 80	4200 ± 210	1110 ± 60
Spectral classification^e:	M7 III e var	M7 III pev	M7 III e g	M7 III e g	N; C7, 5e
Effective temperature^b (K):	3000 ± 300	2800 ± 300	2700 ± 300	2500 ± 300	2650 ± 300
Luminosity^b (L_⊙):	3470 ± 500	5000 ± 500	11 600 ± 1000	5400 ± 500	7850 ± 500
K-band diameter^f (mas):	11.5 ± 1.4	16.6 ± 3.0	24.5 ± 1.2	42.8 ± 3.2	14.5 ± 0.3
Mass-loss rate^g (10^-7 M_⊙ yr^-1):	6–35	0.1–9	0.1–2	0.8–5	10–600
Multiplicity^b:	triple system	SB	wide binary	wide binary	wide binary
Evolutionary stage^b:	TP-AGB	TP-AGB	TP-AGB	early-AGB	post-AGB
Jets/fast wind^b:	no	yes	no	no	yes
Asymmetry^b:	maybe	yes	no	yes	yes
Maser^b:	SiO, H₂O, OH	SiO, H₂O, OH	SiO, H₂O, OH	SiO, H₂O, OH	CO?
Period^b:	decreasing	stable	decreasing	stable	two periods
Others^b:	recent	symbiotic	detached	–	common
	He flash	system	shell, recent		envelope,
		(Mira+WD)	He flash		rapid rotator

Notes.

^(a)

For calibrator properties see Sect. 3.1 and Table 3.

^(b)

See text for references, errors are approximations derived from the values found in the literature.

^(c)

For R Aqr, R Hya and V Hya derived from the period-luminosity relation (cf. Whitelock et al. 2008), and for R Aql and W Hya obtained from maser measurements (Kamohara et al. 2010; Vlemmings et al. 2003, respectively).

^(d)

IRAS flux (Neugebauer et al. 1984).

^(e)

SIMBAD.

^(f)

Values are averages from the literature (cf. Sect. 4.4).

^(g)

Range of current mass-loss rates as given in Sect. 2. For W Hya see e.g. De Beck et al. (2010), Muller et al. (2008) and Justtanont et al. (2005).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.