SIMBAD references

2015AJ....150..204J - Astron. J., 150, 204 (2015/December-0)

Standard stars and empirical calibrations for Hα and Hβ photometry.


Abstract (from CDS):

We define an Hα photometric system that is designed as a companion to the well established Hβ index. The new system is built on spectrophotometric observations of field stars as well as stars in benchmark open clusters. We present data for 75 field stars, 12 stars from the Coma star cluster, 24 stars from the Hyades, 17 stars from the Pleiades, and 8 stars from NGC 752 to be used as primary standard stars in the new systems. We show that the system transformations are relatively insensitive to the shape of the filter functions. We make comparisons of the Hα index to the Hβ index and illustrate the relationship between the two systems. In addition, we present relations that relate both hydrogen indices to equivalent width and effective temperature. We derive equations to calibrate both systems for Main Sequence stars with spectral types in the range O9 to K2 for equivalent width and A2 to K2 for effective temperature.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: (Hyades, Pleiades, Coma, NGC 752) - techniques: photometric - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/AJ/150/204): table2.dat table3.dat table4.dat table5.dat table6.dat>

CDS comments: Tr NN = Cl Melotte 111 NN, vB NNN = Cl Melotte 25 NNN, H NNN = Cl Melotte 22 (HII) NNN. Table 6: NGC 752 126 is not BD+37 361 but BD+36 361.

Simbad objects: 147

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