Table 2.
Classical Cepheids in the inner disk: variation in the parameters.
Name | Photometry |
Spectroscopy |
Instability strip |
||||||
---|---|---|---|---|---|---|---|---|---|
Teff | AV | L | Teff | AV | L | Teff | AV | L | |
(K) | (mag) | (L⊙) | (K) | (mag) | (L⊙) | (K) | (mag) | (L⊙) | |
ID 1 | 4125 ± 409 | 8.6 | 1442 ± 261 | 6375 | 11.8 | 6604 ± 297 | 5125 | 10.6 | 3283 ± 152 |
ID 2 | 7500 ± 743 | 15.4 | 10251 ± 1736 | 6250 | 14.7 | 5393 ± 364 | 5375 | 13.4 | 2614 ± 176 |
ID 3 | 5000 ± 533 | 16.1 | 4081 ± 1708 | 6250 | 17.1 | 8405 ± 269 | 5250 | 16.1 | 4570 ± 146 |
ID 4 | 3900 ± 442 | 7.4 | 923 ± 256 | 6250 | 10.8 | 4773 ± 236 | 5625 | 10.3 | 3338 ± 165 |
ID 5 | 4750 ± 604 | 11.8 | 693 ± 302 | 6000 | 13.9 | 1777 ± 146 | 5625 | 13.4 | 1367 ± 112 |
Notes. Columns 2–4 give the results for the standard fitting of the SED. The interstellar reddening is fixed and the effective temperature and luminosity are fitted. The results are copied from Table 1. Columns 5–7 give the results when the effective temperature is fixed to the spectroscopic value. Quoted is the effective temperature of the model atmosphere closest to it. Inno et al. (2019) quote an error of ±300 K on the spectroscopic effective temperature determination. The luminosity and interstellar reddening are fitted. The error on AV is estimated to be about 1 mag. The error on the luminosity is the formal error scaled to give a reduced χ2 of unity. Columns 8–10 give the results when the effective temperature is fixed to a value that “by eye” would put the star roughly in the middle of the instability strip (cf. Fig. 2). The luminosity and interstellar reddening are fitted. The error on AV is estimated to be about 1 mag. The error on the luminosity is the formal error scaled to give a reduced χ2 of unity.
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