Table 3
Stellar parameters for members in the ϵ Cha association.
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | (14) | (15) | (16) | |
| RA | Dec | T eff | L bol | A V | mass | age | Hα | Ṁ acc | μαcos(δ) | μ δ | ||||||
| ID | (J2000) | (J2000) | Spt | (K) | (L⊙) | (mag) | (M⊙) | (Myr) | (Å) | Class | (M⊙ yr-1) | Disk | (mas/yr) | (mas/yr) | Member | |
|
|
||||||||||||||||
| 1 | 11:59:07.98 | –78:12:32.2 | M4.75 | 3161 | 0.027 | 0 | 0.17/0.14 | 9.6/7.1 | –6.2 | W | ... | N | –35.7 ± 13.6 | –5.8 ± 13.6 | Y | |
| 2A | 11:59:37.53 | –78:13:18.9 | B9 | 10500 | 99.7 | 0 | 2.87/... | 2.7/... | +13 | ... | ... | N | –35.1 ± 1.5 | 4.0 ± 1.9 | Y | |
| 3 | 12:00:03.60 | –78:11:31.0 | ... | ... | ... | ... | .../0.015 | .../5 | ... | ... | ... | ... | ... | ... | Y | |
| 4 | 12:00:04.00 | –78:11:37.0 | ... | ... | ... | 4.5 | 0.42/0.17 | 4 | ... | ... | ... | Y | ... | ... | Y | |
| 5 | 12:00:05.12 | –78:11:34.7 | A7.75 | 7648 | 42.8 | 0.91 | 2.53/... | 3.2/... | –20 | H | 4.17E-07 | Y | –36.9 ± 1.4 | –5.6 ± 1.8 | Y | |
| 6 | 12:00:08.30 | –78:11:39.6 | M3.5 | 3342 | 0.12 | 0 | 0.29/0.30 | 3.0/3.8 | –3.9 | W | ... | N | ... | ... | Y | |
| 7 | 12:00:09.32 | –78:11:42.5 | K5.5 | 4278 | 0.92 | 1.0 | 0.90/1.33 | 2.1/5.9 | –4.5 | C | 8.59E-10 | Y | ... | ... | Y | |
| 8 | 12:01:44.42 | –78:19:26.8 | M5 | 3125 | 0.036 | 0 | 0.16/0.14 | 5.1/4.5 | –23 | C | 1.49E-11 | Y | –31.5 ± 7.7 | 0.5 ± 7.7 | Y | |
| 9 | 12:01:52.52 | –78:18:41.4 | M4.75 | 3161 | 0.039 | 0 | 0.18/0.15 | 5.9/5.0 | –7.8 | W | ... | N | –28 ± 7.7 | –34 ± 7.7 | ? | |
| 10 | 12:00:55.17 | –78:20:29.7 | M5.75 | 3024 | 0.029 | 0 | 0.11/0.10 | 3.1/3.5 | –23.7 | C | 1.05E-11 | Y | –33.6 ± 7.7 | –2.2 ± 7.7 | Y | |
| 11 | 12:01:43.43 | –78:35:47.2 | M2.25 | 3524 | 0.0038 | 0 | 0.27/0.49 | 4 | –192.4 | C | ... | Y | –43.1 ± 8.8 | –6.5 ± 8.8 | Y | |
| 12 | 12:07:45.98 | –78:16:06.5 | M3.75 | 3306 | 0.042 | 0 | 0.27/0.25 | 12.5/11.4 | –7.9 | W | ... | N | –68.7 ± 7.8 | –17.9 ± 7.7 | ? | |
Notes. Columns 4, 5: the values come from Luhman (2004). Columns 8, 9: the masses and ages of the sources ID#1,4,6,7,8,9,10,11,12 are estimated from Dotter et al. (2008) and Baraffe et al. (1998), respectively. For the sources ID#2A,5 with masses larger than 1.4 M⊙, their masses and ages are estimated from Dotter et al. (2008), and for the source ID#3 with a mass less than 0.1 M⊙, its mass and age are from Baraffe et al. (1998). Column 10: The equivalent widths (EW) of Hα line for ID#1,2,5,6,7,8,9 come from Feigelson et al. (2003). The EWs of Hα line for ID#10,11,12 are estimated from the optial spectra presented in Lyo et al. (2008). Negative values mean Hα line in emission. Column 11: W for weak T Tauri star (WTTS), C for classical T Tauri star (CTTS), and H for Herbig Ae/Be star.
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