Diffuse interstellar band λ6614 as a distance tracer for the Perseus, Taurus, and Orion molecular clouds: Feasibility and limitations

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Volume 702 (October 2025)

A&A, 702 (2025) A58

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Table 1

Fitted cloud distances and sizes.

Cloud	ℓ	b	d₆₆₁₄	d_E(BP–RP)	S₆₆₁₄	S_E(BP–RP)
	deg	deg	pc	pc	pc	pc
(1)	(2)	(3)	(4)	(5)	(6)	(7)
Perseus	158.87	−20.95	${297.20}_{- 2.57}^{+ 3.45}$ $297.20_{ - 2.57}^{ + 3.45}$	${288.79}_{- 0.17}^{+ 0.18}$ $288.79_{ - 0.17}^{ + 0.18}$	${36.60}_{- 2.57}^{+ 4.11}$ $36.60_{ - 2.57}^{ + 4.11}$	${24.44}_{- 0.17}^{+ 0.37}$ $24.44_{ - 0.17}^{ + 0.37}$
Taurus	170.56	−15.57	${150.20}_{- 2.08}^{+ 2.34}$ $150.20_{ - 2.08}^{ + 2.34}$	${140.62}_{- 0.22}^{+ 0.22}$ $140.62_{ - 0.22}^{ + 0.22}$	${38.89}_{- 2.08}^{+ 1.97}$ $38.89_{ - 2.08}^{ + 1.97}$	${29.93}_{- 0.22}^{+ 0.26}$ $29.93_{ - 0.22}^{ + 0.26}$
Orion A	211.27	−18.66	${421.12}_{- 1.28}^{+ 1.33}$ $421.12_{ - 1.28}^{ + 1.33}$	${413.94}_{- 0.15}^{+ 0.14}$ $413.94_{ - 0.15}^{ + 0.14}$	${10.92}_{- 1.28}^{+ 1.35}$ $10.92_{ - 1.28}^{ + 1.35}$	${21.11}_{- 0.15}^{+ 0.18}$ $21.11_{ - 0.15}^{ + 0.18}$
Orion B	205.71	−13.81	${409.80}_{- 1.45}^{+ 1.49}$ $409.80_{ - 1.45}^{ + 1.49}$	${406.36}_{- 0.14}^{+ 0.15}$ $406.36_{ - 0.14}^{ + 0.15}$	${18.32}_{- 1.15}^{+ 2.62}$ $18.32_{ - 1.15}^{ + 2.62}$	${19.25}_{- 0.14}^{+ 0.25}$ $19.25_{ - 0.14}^{ + 0.25}$

Notes. (1) Names of the molecular cloud regions. (2) and (3) represent the galactic longitude and latitude of the center of the selected molecular cloud region. (4) and (6) are the fitted distance and size of the cloud based on EW₆₆₁₄, corresponding to d and 2δ_d from Eq. (4), respectively, along with their associated uncertainties. (5) and (7) are the fitted distance and size from E(BP–RP), along with their respective uncertainties.

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