Observational studies of Cepheid amplitudes - I. Period-amplitude relationships for Galactic Cepheids and interrelation of amplitudes

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Volume 504 / No 3 (September IV 2009)

A&A, 504 3 (2009) 959-972

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Table 3:

Slopes of the linear relationships between various amplitudes (omitting the known binaries). ``Ratio'' refers to the rate of slopes in the sense value for long- over value for short-period Cepheids.
	Slope	$\sigma_{\rm slope}$	N	Slope	$\sigma_{\rm slope}$	N	Ratio	Slope	$\sigma_{\rm slope}$	N
Amplitudes	Fundamental mode							1st overtone
involved	$\log P < 1.02$			$\log P > 1.02$
A_U - A_V	1.856	0.027	18	2.192	0.037	22	1.182	1.940	0.045	8
A_B - A_V	1.449	0.007	119	1.515	0.008	54	1.046	1.471	0.007	30
A_R - A_V	0.784	0.003	118	0.779	0.004	56	0.994	0.808	0.005	28
A_I - A_V	0.622	0.004	90	0.606	0.005	49	0.974	0.620	0.003	24
$A_{V_{\rm RAD}}$ - A_V	47.93	0.73	64	47.76	0.86	35	0.996	50.93	0.90	26
A_R - A_B	0.540	0.002	111	0.513	0.004	51	0.950	0.548	0.008	28
A_I - A_B	0.424	0.003	82	0.398	0.004	46	0.939	0.423	0.007	24
$A_{V_{\rm RAD}}$ - A_B	32.81	0.50	63	31.12	0.59	33	0.948	34.62	0.92	26

Source LaTeX | All tables | In the text

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