GG Tauri: the fifth element | Astronomy & Astrophysics (A&A)

Home

All issues

Volume 565 (May 2014)

A&A, 565 (2014) L2

Full HTML

Free Access

Table 2

Photometry of the triple system: estimate of the IR flux excess from the apparent magnitudes, the estimated extinction and the spectral type for GG Tau Aa and for the close binary Ab1–Ab2.

	A _V	I		J		H		K _s		L′
		mag	σ	mag	σ	mag	σ	mag	σ	mag	σ

Aa (observed)^a	0.30	10.46	0.02	9.24	0.21	8.27	0.25	7.73	0.16	6.72	0.13
Aa (dereddened)^b		10.26		9.14		8.21		7.69		6.81
Aa (M0V)^c		10.26		9.26		8.63		8.46		8.32

F_excess/F_tot^d		0		0.10	0.17	0.32	0.16	0.51	0.07	0.75	0.03

Ab1+Ab2 (obs.)^a	0.45	12.19	0.04	10.12	0.21	9.07	0.32	8.53	0.24	7.69	0.04
Ab1+Ab2 (dered.)^b		11.89		9.97		8.98		8.47		7.66
Ab1 (M2V)^c		12.16		11.01		10.31		10.11		9.95
Ab2 (M3.5V)^c		13.53		12.13		11.48		11.23		11.02

/ (M2/M3)^e		2.1		1.9		1.9		1.8		1.7
/ (M2/M3.5)^e		3.5		2.8		2.9		2.8		2.7

F_excess/F_tot (M2/M3)^d		0		0.48	0.10	0.61	0.12	0.70	0.07	0.83	0.02

Notes.

^(a)

Spatially resolved apparent magnitudes from Hartigan & Kenyon (2003),

^(b)

extinction-corrected magnitudes,

^(c)

expected magnitudes from color-index and the spectral-type estimate (assuming I-band flux has a purely photospheric origin,

^(d)

estimated flux excess from circumstellar material for the adopted spectral type(s),

^(e)

expected flux ratios between the stellar components Ab1 and Ab2 for the given spectral types.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.