R Coronae Borealis and dustless hydrogen-deficient carbon stars likely have different oxygen isotope ratios

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Volume 667 (November 2022)

A&A, 667 (2022) A84

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Table 2.

Range of model parameters that best fit the observed spectra.

Name	Class	Temperature	log(ϵ(N))	f_dust	¹⁶O/¹⁸O
B42 ^(a)	dLHdC	4500–5000 ^(c)	7.0–7.5	0	0.01–0.1
C38	dLHdC	5000–5800 ^(c)	9.4	0	0.05–0.2
B566	dLHdC	5000–5800 ^(c)	9.4	0	0.05–0.5

HD 137613	dLHdC	4500–5000 ^(c)	7.5–9.4	0	0.05–0.5
A223	dLHdC	5000–5800 ^(c)	9.4	0	0.2–1
HD 182040	dLHdC	5000–5800 ^(c)	8.5–9.4	0	0.1–0.5
A166	dLHdC	4000–6000 ^(d)	7.0–9.4	0	> 20
HD 175893	RCB	4500–5000 ^(c)	7.0–9.4	0–0.5	0.01 − 0.2
ASAS-RCB-11	RCB	4500–5000 ^(c)	7.0–9.4	0–0.3	0.01 − 0.2
WX Cra	RCB	4100-4500 ^(c)	7.0–9.4	0–0.2	0.05 − 1
EROS2-CG-RCB-6	RCB	4500–5750 ^(d)	7.0–9.4	0–0.8	0.2 − 5
IRAS 1813.5-2419	RCB	3900–4100 ^(c)	7.0–9.4	0–0.5	0.2 − 20
S Aps ^(a)	RCB	4100–4500 ^(c)	7.0	0–0.8	1 − 5
SV Sge ^(a)	RCB	3900–4100 ^(c)	7.0–9.4	0	1 − 5
HV 5637	RCB	4500–5750 ^(d)	7.0–9.4	0–0.8	1 − 50
ES Aql ^(a)	RCB	4500–6000 ^(d)	7.0–9.4	0–0.3	2 − 20
Z Umi	RCB	4750–5500 ^(d)	9.4	0.5-0.8	1 − 20
EROS2-SMC-RCB-2	RCB	4500–6000 ^(d)	7.0–9.4	0–0.8	2 − 50
EROS2-SMC-RCB-3	RCB	5250–6000 ^(d)	9.4	0.5-0.8	5 − 50
V1783 Sgr	RCB	4100–4500 ^(c)	9.4	0.7-0.8	5 − 50
U Aqr	RCB	4100–4500 ^(c)	9.4	0.4-0.8	5 − 50
EROS2-CG-RCB-10	RCB	4500–5750 ^(d)	7.0–9.4	0–0.8	5 − 50
ASAS-RCB-17	RCB	4100–4500 ^(c)	7.0–9.4	0–0.1	5 − 50
NSV 11154	RCB	5250–5500 ^(e)	7.0–9.4	0–0.2	10 − 50
V1157 Sgr	RCB	3900–4100 ^(c)	7.0–9.4	0–0.8	> 10
ASAS-RCB-16	RCB	4100–4500 ^(c)	7.0	0	> 20
MACHO-401.48170.2237	RCB	4500–6000 ^(d)	7.0–9.4	0–0.8	> 20
ASAS-RCB-18	RCB	3750–3900 ^(c)	7.0–9.4	0–0.8	> 20
WISE_J174328.50-375029.0	RCB	3900–4100 ^(c)	7.0–9.4	0–0.6	> 50
ASAS-RCB-19	RCB	3750–3900 ^(c)	7.0–9.4	0.5-0.6	> 50
MACHO-308.38099.66	RCB	4000–5500 ^(d)	7.0–9.4	0–0.8	> 50
ASAS-RCB-4	RCB	3750–3900 ^(c)	7.0–9.4	0–0.2	> 50
EROS2-CG-RCB-13 ^(f)	RCB	4500–5500 ^(d)	7.0–9.4	0–0.8	> 500
EROS2-CG-RCB-3 ^(f)	RCB	6000–6500 ^(d)	9.4	0–0.3	> 500
EROS2-CG-RCB-4 ^(b)^(f)	RCB	4500–5500 ^(d)	7.0–9.4	0–0.8	> 500
V517 Oph ^(f)	RCB	4500–5500 ^(d)	7.0–9.4	0–0.8	> 500
ASAS-RCB-7 ^(f)	RCB	3750–3900 ^(c)	7.0–9.4	0–0.8	> 500
OGLE-GC-RCB-1 ^(f)	RCB	4100–4500 ^(c)	7.0–9.4	0–0.4	> 500
ASAS-RCB-5 ^(f)	RCB	3900–4100 ^(c)	7.0–9.4	0–0.6	> 500
WISE_J194218.38-203247.5 ^(f)	RCB	3900–4100 ^(c)	7.0–9.4	0–0.8	> 500

Notes.

^(a)

The ¹²C¹⁶O absorption bands are possibly saturated, and the ¹⁶O/¹⁸O is likely underestimated.

^(b)

EROS2-CG-RCB-4 shows ¹³C¹⁶O absorption bands.

^(c)

Photometry based temperature range estimates from Crawford et al. (in prep).

^(d)

Temperature ranges based on the models that are good fits to the NIR spectra.

^(e)

Temperature range from SED fit in (Karambelkar et al. 2021).

^(f)

The medium resolution spectra do not show any strong ¹²C¹⁸O bandheads, but it is possible that these bands are not detected due to a combination of low resolution, low S/N, saturation and dust-dilution of CO bandheads (see Sect. 4.2.2).

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