2009A&A...501..985T


Query : 2009A&A...501..985T

2009A&A...501..985T - Astronomy and Astrophysics, volume 501, 985-998 (2009/7-3)

New Magellanic cloud R Coronae Borealis and DY Persei type stars from the EROS-2 database: the connection between RCBs, DYPers, and ordinary carbon stars.

TISSERAND P., WOOD P.R., MARQUETTE J.B., AFONSO C., ALBERT J.N., ANDERSEN J., ANSARI R., AUBOURG E., BAREYRE P., BEAULIEU J.P., CHARLOT X., COUTURES C., FERLET R., FOUQUE P., GLICENSTEIN J.F., GOLDMAN B., GOULD A., GROS M., DE KAT J., LESQUOY E., LOUP C., MAGNEVILLE C., MAURICE E., MAURY A., MILSZTAJN A., MONIEZ M., PALANQUE-DELABROUILLE N., PERDEREAU O., RICH J., SCHWEMLING P., SPIRO M. and VIDAL-MADJAR A.

Abstract (from CDS):

R Coronae Borealis stars (RCB) are a rare type of evolved carbon-rich supergiant stars that are increasingly thought to result from the merger of two white dwarfs, called the Double degenerate scenario. This scenario is also studied as a source, at higher mass, of type Ia Supernovae (SnIa) explosions. Therefore a better understanding of RCBs composition would help to constrain simulations of such events. We searched for and studied RCB stars in the EROS Magellanic Clouds database. We also extended our research to DY Per type stars (DYPers) that are expected to be cooler RCBs (T∼3500K) and much more numerous than their hotter counterparts. With the aim of studying possible evolutionary connections between RCBs and DYPers, and also ordinary carbon stars, we compared their publically available broad band photometry in the optical, near, and mid-infrared. The light curves of ∼70 millions stars, monitored for 6.7 years (from July 1996 to February 2003), have been analysed to search for the main signature of RCBs and DYPers: a large (up to 9 mag) drop in luminosity. Carbon stars with fading episodes were also found by inspecting numerous light curves of objects that presented an infrared excess in the 2MASS and Spitzer- SAGE and S3MC databases. Follow-up optical spectroscopy was used to confirm each photometric candidate found. We have discovered and confirmed 6 new Magellanic Cloud RCB stars and 7 new DYPers, but also listed new candidates: 3 RCBs and 14 DYPers. Optical and infrared colour magnitude diagrams that give new insights into these two sets of stars are discussed. We estimated a range of Magellanic RCB shell temperatures between 360 and 600K. We confirm the wide range of absolute luminosity known for RCB stars, MV~-5.2 to -2.6. Our study further shows that mid-infrared surveys are ideal to search for RCB stars, since they have thinner and cooler circumstellar shells than classical post-AGB stars. In addition, by increasing the number of known DYPers by ∼400%, we have been able to shed light on the similarities in the spectral energy distribution between DYPers and ordinary carbon stars. We also observed that DYPer circumstellar shells are fainter and hotter than those of RCBs. This suggests that DYPers may simply be ordinary carbon stars with ejection events, but more abundance analysis is necessary to give a status on a possible evolutionnary connexion between RCBs and DYPers.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: carbon - supergiants - Magellanic Clouds

Nomenclature: Tables 1-2: [TWM2009] EROS2-SMC-RCB-N (Nos 1-4), [TWM2009] EROS2-SMC-DYPer-N (Nos 1-6), [TWM2009] EROS2-LMC-RCB-N (Nos 1-8), [TWM2009] EROS2-LMC-DYPer-NN (Nos 1-17).

CDS comments: Table 1 MSX LMC 755 is a probable misprint for MSX LMC 775.

Simbad objects: 79

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Number of rows : 79
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 RAW 21 C* 00 37 47.0976654168 -73 39 02.403102492     17.69     C 10 0
2 [MH95] 431 C* 00 40 14.7081048888 -74 11 21.516513252     17.130   14.854 C 7 0
3 RAW 233 RC* 00 44 07.5089400696 -72 44 16.285999056   20.28 18.67   15.64 C 8 0
4 DCMC J004454.38-731529.0 RV* 00 44 54.0871617000 -73 15 29.496369168   17.87 15.79   13.51 ~ 6 0
5 [TWM2009] EROS2-SMC-DYPer-6 RC* 00 44 56.4544730928 -73 12 24.594923376     17.562   15.45 C 8 0
6 MSX SMC 014 Mi* 00 46 16.33 -74 11 13.6         19.872 ~ 12 0
7 ABW-A 242 RC* 00 47 41.7611858808 -73 06 16.111600020   19.20 16.66   15.01 C 11 0
8 RAW 476 C* 00 48 22.9516608504 -73 41 04.650133380 16.17 15.69 14.64   13.53 C 11 0
9 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10538 1
10 RAW 961 RC* 00 55 54.9496467960 -72 35 11.748482700   20.21 17.96   15.93 C 7 0
11 [MH95] 672 RC* 00 56 35.4833384376 -71 32 33.270775800   19.42 17.22   14.83 C 7 0
12 [TWM2009] EROS2-SMC-RCB-3 RC* 00 57 18.15 -72 42 35.2           ~ 16 0
13 [TWM2009] EROS2-SMC-RCB-4 RC* 01 04 53.15 -72 04 04.0         17.28 ~ 7 0
14 V* DY Per RC* 02 35 17.1274583280 +56 08 44.717128260   12.88 11.09 9.93 8.64 C-R4+ 72 0
15 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6564 1
16 LMC-BM 5-9 C* 04 52 58.4249734272 -69 10 27.431176296     16.720 14.817 14.759 C 7 0
17 2MASS J04551574-7017421 pA? 04 55 15.7624635312 -70 17 42.195325308 15.820 15.658 15.099 15.04 14.36 A3II 2 0
18 [KDM2001] 1033 C* 04 56 28.5349046736 -69 39 12.548193372     16.47 14.509 13.37 C 6 0
19 2MASS J04584835-7237434 RC* 04 58 48.4041598032 -72 37 43.460562504       17.840 17.17 ~ 6 0
20 SP77 30-16 C* 04 59 35.8340840040 -68 24 44.814544812     14.333 14.362 13.17 C1,2Hd 11 0
21 SV* HV 12524 RC* 05 01 00.3783882792 -69 03 43.134706944     14.580   13.324 C 7 0
22 2MASS J05021715-6824056 LP* 05 02 17.1748528440 -68 24 05.771660076     16.18 13.599 13.31 ~ 5 0
23 2MASS J05034465-6938117 LP* 05 03 44.6928911016 -69 38 11.626497132     17.52 14.245 16.292 ~ 7 0
24 2MASS J05075645-7034537 Or* 05 07 56.4484051824 -70 34 53.858234928 18.610 18.915 18.195 15.57 15.87 ~ 7 0
25 SP77 39-12 RC* 05 10 28.5331700472 -69 47 04.492628844 19.187 19.396 14.20 13.62 13.22 C2,2Hd 13 0
26 SV* HV 5637 RC* 05 11 31.3800261672 -67 55 50.814148260     14.69 13.688 13.528 C 33 1
27 [KDM2001] 2831 C* 05 14 40.2221828088 -69 58 39.966620124     15.239   16.98 C 8 0
28 SV* HV 2379 RC* 05 14 46.1910774888 -67 55 47.642837844     16.31 15.132 13.427 ~ 20 0
29 OGLE LMC-RCB-8 RC* 05 15 51.792 -69 10 08.64     15.83 15.735 13.583 ~ 8 0
30 [KDM2001] 3071 C* 05 16 51.9479270496 -68 45 16.832664432     16.33 13.940 13.991 C 8 0
31 [KDM2001] 3340 C* 05 19 48.1600245408 -65 58 22.554642900     15.75 14.135 13.88 C 4 0
32 [KDM2001] 3353 C* 05 19 55.9439738208 -69 48 05.894316828     16.30 14.121 14.234 C 8 0
33 2MASS J05202285-6904428 LP* 05 20 22.8718294752 -69 04 42.881816064     17.39 15.388 15.21 ~ 5 0
34 OGLE LMC-RCB-10 RC* 05 20 48.210 -70 12 12.54     17.912   14.943 ~ 10 0
35 SV* HV 942 RC* 05 21 47.9691660264 -70 09 57.093484752 16.748 18.233 15.247 14.04 14.209 ~ 15 1
36 NAME LMC Bar PoG 05 22 08 -69 23.5           ~ 299 0
37 OGLE LMC-RCB-12 RC* 05 22 57.3754122648 -68 58 18.895423548     17.58 16.285 14.223 C? 8 0
38 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16525 1
39 IRAS F05254-7149 RC* 05 24 43.6388541528 -71 47 26.417936508   20.838 20.409   19.753 C-rich 10 0
40 DCMC J052554.90-694353.8 RC* 05 25 54.966 -69 43 53.94     16.69 14.420 14.550 C 9 0
41 V* W Men RC* 05 26 24.5307101256 -71 11 11.796721620     13.40   13.323 F5I:/C 50 0
42 OGLE LMC-RCB-14 RC* 05 26 33.9230401032 -69 07 33.347170308     17.49 15.179 13.667 C 10 0
43 EROS2-star lm033-7L-17621 RV* 05 27 12.6145829688 -67 35 07.435646196       14.748 14.39 ~ 3 0
44 2MASS J05273232-6905354 LP* 05 27 32.3258107133 -69 05 35.465836987     17.209 14.633 14.22 ~ 4 0
45 [KDM2001] 4359 C* 05 29 22.5947636400 -70 19 35.884870500     16.64 13.772 14.37 C 8 0
46 [KDM2001] 4370 C* 05 29 26.1913885248 -67 00 22.547764080     18.21 14.386 14.87 C 4 0
47 2MASS J05292721-6922324 LP* 05 29 27.2257281816 -69 22 32.503357416     16.82 15.062 14.92 ~ 6 0
48 BSDL 2075 Cl* 05 30 42.81 -69 39 01.7           ~ 5 0
49 OGLE LMC-LPV-64293 RC* 05 30 43.2404167248 -69 38 51.853576884     16.38 14.378 14.09 ~ 5 1
50 OGLE LMC-RCB-17 RC* 05 32 13.3497958320 -69 55 57.679962240     19.19 16.909 14.440 ~ 8 0
51 LMC-BM 32-9 C* 05 32 56.1886800048 -68 12 48.752152488 20.895 20.806 20.412 15.424 16.242 C 14 0
52 SV* HV 2671 RC* 05 33 48.9473907384 -70 13 23.504301372     15.758   15.391 ~ 31 1
53 OGLE LMC-LPV-72055 RC* 05 35 15.4088801928 -69 57 43.685698248     16.27 14.731 14.38 ~ 4 0
54 [KDM2001] 5039 C* 05 35 24.0852465216 -66 24 15.157024272       14.541 14.70 C 3 0
55 [KDM2001] 5419 C* 05 39 00.3366554856 -70 58 01.216130160     16.69 14.192 14.35 C 8 0
56 OGLE LMC-RCB-19 RC* 05 39 36.9800605464 -71 55 46.796098764     15.142 16.853 13.378 ~ 7 0
57 SP77 55-17 RC* 05 41 23.4958110720 -70 58 01.757641224     14.92 14.87 13.976 C 11 1
58 [KDM2001] 5900 C* 05 44 04.0148796912 -65 46 00.499805112         14.37 C 4 0
59 SV* HV 12842 RC* 05 45 02.8825680504 -64 24 22.722012612     13.7     ~ 25 1
60 SP77 55-23 C* 05 46 13.2785249088 -71 07 40.321469172     15.78 14.410 14.054 C 10 0
61 OGLE J054647.84-703813.9 RC* 05 46 47.7414405576 -70 38 13.425578052     15.74 13.910 13.410 C 10 0
62 2MASS J05482227-6758532 LP* 05 48 22.3173034968 -67 58 53.330470320 18.260 18.885 18.165 17.044 16.80 ~ 9 0
63 [KDM2001] 6448 C* 05 50 15.5228936064 -71 57 39.467683908     15.98 14.335 13.80 C 8 0
64 SP77 65-2 C* 06 04 05.4757334376 -72 51 22.784017464     14.380 14.290 13.25 C2,2Hd 11 0
65 [KDM2001] 7151 C* 06 05 35.3436499584 -68 54 53.953336512     16.549 14.337 14.199 C 5 0
66 EROS2-star lm086-4M-16909 RC* 06 12 10.5123716592 -74 05 09.934738548       17.561   ~ 4 0
67 [KDM2001] 7544 C* 06 18 46.6001127504 -67 00 59.414734872       13.760 13.71 C 3 0
68 V* R CrB RC* 15 48 34.4154827352 +28 09 24.295852440 6.44 6.31 5.71 5.26 5.08 G0Iep 770 0
69 EROS2-star cg1235m14181 RC* 17 19 58.5113727768 -30 04 21.507107592           ~ 5 0
70 V* V2552 Oph RC* 17 23 14.5548283752 -22 52 06.314546712   11.90 10.92     C-Hd 26 0
71 Terz V 2960 RC* 17 39 20.7391600224 -27 57 22.685213304           ~ 6 0
72 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13453 0
73 EROS2-star cg0030l3740 RC* 17 52 20.0378878752 -29 03 31.690060092           ~ 6 0
74 V* V4334 Sgr CV* 17 52 32.69352 -17 41 08.0160           F2Ia 361 0
75 2MASS J17524872-2845190 RC* 17 52 48.72 -28 45 19.1           ~ 5 0
76 PN A66 58 PN 19 18 20.476 +01 46 59.62           [WC4] 311 0
77 V* ES Aql RC* 19 32 21.6146259144 -00 11 30.957877284     11.76 12.12   C 35 0
78 Hen 1-5 pA* 20 11 56.0595568008 +20 20 04.420944132 11.41 10.66 9.45     G8/K0Iae 502 0
79 NAME Galactic Bulge reg ~ ~           ~ 4015 0

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2023.02.05-04:49:27

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