Proposed cool stars temperatures update

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onetwothree
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Proposed cool stars temperatures update

Post #1by onetwothree » 10.12.2019, 16:43


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Lafuente_Astronomy
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Post #2by Lafuente_Astronomy » 10.12.2019, 22:48

I'm no master on Star Temperatures but did you use accurate sources to determine the temperatures of such stars?
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Post #3by Fafers_br » 11.12.2019, 01:47

No objections. I see you are propposing the temperatures from E. Mamajek's table. I think it's a good source.

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Post #4by Joey P. » 12.12.2019, 01:26

I think a reasonable rule-of-thumb for star temperatures is that M-type stars usually have temperatures between 3,000 to 4,000 Kelvin or Celsius, type K are between 4,000 to 5,000, and G-type 5,000 to 6,000 (remember there is a relatively small difference between Celsius (subtract 273 from) and Kelvin).
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Post #5by fyr02 » 12.12.2019, 16:22

Joey P.
Although this is somewhat correct - but we are looking for the specific temperatures for each spectral type (M0, M1, M2, M3, etc.)
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Post #6by Joey P. » 13.12.2019, 05:58

fyr02 wrote:
Joey P.
Although this is somewhat correct - but we are looking for the specific temperatures for each spectral type (M0, M1, M2, M3, etc.)

There's a rough guide here (also including carbon stars, of course):
https://en.wikipedia.org/wiki/Carbon_star#Morgan–Keenan_C_system
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Post #7by SevenSpheres » 13.12.2019, 22:02

Joey P., this is a better and more complete source, which is why I used it for this pull request.
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Post #8by Joey P. » 14.12.2019, 02:18

Oh yes, that's right. But what about metallicity ("metals" = everything that is not hydrogen or helium)?
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Post #9by Sirius_Alpha » 14.12.2019, 18:36

Oh yes, that's right. But what about metallicity
Most stars do not have readily accessible metallicities (as far as I know), certainly not in a systematized way like the data products from Hipparcos or Gaia. If there is a useful [M/H]-T_{eff}-Spectral table out there somewhere, it isn't clear how easily this could be implemented in Celestia's default distribution.
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