Miscellanea - Zams - Empirical Calibrations

ZAMS - Various authors zero age main sequence empirical calibrations.

1) Beker

I apologize for the use of the Italian notation. So, in the following, the commas should always be read as dots.

Analytical form: Mv = 196,54(B-V)o⁶-233,35(B-V)o⁵+26,918(B-V)o⁴+56,818(B-V)o³-20,835(B-V)o³+6,6794(B-V)+1,4838

2) Blaauw

Analytical form: Mv = -1,2121(B-V)o⁶+18,132(B-V)o⁵-46,054(B-V)o⁴+42,55(B-V)o³-14,986(B-V)o³+6,8913(B-V)+1,4515

3) Eggen

Analitical form: Mv = -1,2121(B-V)o⁶+18,132(B-V)o⁵-46,054(B-V)o⁴+42,55(B-V)o³-14,986(B-V)o³+6,8913(B-V)+1,4515

4) Johnson

Analytical form: Mv = -5,5539(B-V)o⁶+28,68(B-V)o⁵-53,014(B-V)o⁴+42,63(B-V)o³-14,462(B-V)o³+7,1092(B-V)+1,4026

5) Mermilliod

Analytical form: Mv = 70,886(B-V)o⁶-108,12(B-V)o⁵+14,865(B-V)o⁴+41,265(B-V)o³-17,994(B-V)o³+6,504(B-V)+1,5854

6) Turner

Analytical form: Mv = -22,328(B-V)o⁶+63,714(B-V)o⁵-74,353(B-V)o⁴+42,904(B-V)o³-10,999(B-V)o³+6,2248(B-V)+1,4461

7) Keenan

Analytical form: Mv = -3,3496(B-V)o⁶+19,855(B-V)o⁵-41,663(B-V)o⁴+38,905(B-V)o³-15,979(B-V)o³+8,2538(B-V)+0,9644

8) Schmidt-Kaler Luminosity Class V

Analitycal form: Mv = -6,3652(B-V)o⁶+31,674(B-V)o⁵-55,067(B-V)o⁴+40,913(B-V)o³-13,276(B-V)o³+7,8757(B-V)+0,87

ZAMS - comparisons over Early Type region.

In the next figure all the calibrations are Zero Age Main Sequences while only the Schmidt-Kaler curve represents the Luminosity Class V.

© 2006 - Valter Arnò