The Appearance and Disappearance of Exocomet Gas Absorption

Table 4

Physical parameters of A-stars with circumstellar CaII K-line absorption.

Star HD#	Spectral type		Age	Mid-IR excess?	Chemically peculiar?	Boo star?	EW481	Reference
		(km s^−1)	(Myr)				(A)
Stars not showing FEB activity
HD 21688	A5III/IV shell	196	Unknown	Y	Unlisted	N	0.52	[3]
HD 38090	A2/A3V shell	207	Unknown	Unknown	N	N	0.47	[3]
HD 38545	A3V shell	191	13	N	N	N	0.42	[3]
HD 39182	A2V shell	238	Unknown	Unknown	N	N	0.38	[27]
HD 80007	A2IV/V	145	260	N	Unlisted	N	Unlisted	This work
HD 102647	A3V	110	50	Y	N	N	0.57	[3]
HD 141569	AOVe	228	5.4	Y	Unlisted	N	Unlisted	[3]
HD 148283	A5V	280	Unknown	N	N	N	0.4	[3]
HD 158352	A7V shell	180	600	Y	N	N	0.60	This work
HD 165459	AlV	Unknown	5	Y	Unlisted	N	Unlisted	[3]
HD 183324	AOV	110	10	Y	Y	Y	0.16	[3]
HD 184006	A5V	210	450	N	N	N	0.50	This work
HD 223884	A5V shell	241	5.5	N	N	N	0.46	[27]
Stars exhibiting FEB activity
HD 256	A2IV/V shell	241	1.8	N	N	N	0.31	[28]
HD 9672	AlV	196	8.9	Y	N	N	0.64	[15]
HD 21620	AOVn shell	217	80	Y	Y	N	0.33	[3]
HD 39060	A6V shell	122	12	Y	N	N	Unlisted	[11]
HD 42111	A3Vn shell	120	0.2	N	N	N	0.46	[3]
HD 56537	A3V	154	550	Y	N	N	0.59	This work
HD 58647	B91Ve	118	0.4	Y	Unlisted	N	Unlisted	This work
HD 64145	A3V	165	Unknown	N	Unlisted	N	0.64	This work
HD 85905	A2/A3III shell	264	Unknown	N	Unlisted	N	0.37	[27]
HD 108767	AOIV	236	260	Y	N	N	Unlisted	This work
HD 109573	AO	152	8	Y	N	N	Unlisted	This work
HD 110411	AOV	154	100	Y	Y	Y	0.21	[3]
HD 145964	B9V	306	5	N	Y	Weak	0.32	[3]
HD 172555	A7V	116	12	Y	Unlisted	N	Unlisted	[14]
HD 182919	AOV	154	100	Y	N	N	0.44	[15]
HD 217782	A3Vn shell	212	Unknown	N	N	Weak	0.48	[15]