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Table 1

Log of OSIRIS/GTC observations.

Name Alternative α δ Date of t exp Airmass Seeing Trans-
name (J2000) (J2000) observation [s] [arcsec] parencya

Mayrit 783254 2E 1455 05 37 54.40 –02 39 29.8 04 Mar. 2012 3  ×  30 1.82  ≳2.5 Thin
Mayrit 528005 AB [W96] 4771–899 05 38 48.03 –02 27 14.1 18 Mar. 2012 3  ×  45 1.86  ≳1.8 Clear
Mayrit 609206 V505 Ori 05 38 27.25 –02 45 09.6 18 Mar. 2012 3  ×  45 1.48  ≳1.4 Clear
* Mayrit 957055 [SWW2004] 163 05 39 37.30 –02 26 56.8 04 Mar. 2012 1  ×  600 1.37  ≲1.5 Thin
* Mayrit 180277 b [W96] rJ053832–0235b 05 38 32.84 –02 35 39.2 04 Mar. 2012 2  ×  300 1.20  ≲1.4 Thin
* Mayrit 156353 [W96] rJ053843–0233 05 38 43.55 –02 33 25.4 04 Mar. 2012 2  ×  300 1.25  ≲1.6 Thin
* Mayrit 662301 Kiso A–0904 67 05 38 06.74 –02 30 22.8 04 Mar. 2012 2  ×  300 1.30  ≲1.5 Thin
* Mayrit 1298302 [SWW2004] 137 05 37 31.54 –02 24 27.0 04 Mar. 2012 1  ×  600 1.57  ≲2.5 Thin
* Mayrit 872139 c [BZR99] S Ori 28 05 39 23.19 –02 46 55.8 31 Mar. 2012 1  ×  900 2.01 1.5 Clear
* Mayrit 1196092 d J054004.5–023642 05 37 31.54 –02 24 27.0 12 Mar. 2012 1  ×  900 1.84 1.5 Clear
UCM0535–0246 2E 1456 05 37 56.31 –02 45 13.1 17 Mar. 2012 1  ×  1200 1.99  ≳2.5 Clear
LP 379–51 GJ 3790 (M2.0 V) 13 31 50.57 +23 23 20.3 16 Mar. 2012e 2  ×  30 1.22 1.3 Thick
Ross 1022 GJ 3795 (M3.0 V) 13 38 37.05 +25 49 49.7 16 Mar. 2012e 3  ×  30 1.19 1.2 Thick
LP 799–7 GJ 3820 (M4.0 V) 13 59 10.46 –19 50 03.5 16 Mar. 2012e 3  ×  60 1.51 1.2 Thick
FN Vir GJ 493.1 (M4.5 V) 13 00 33.51 +05 41 08.2 16 Mar. 2012e 2  ×  60 1.20 1.3 Thick
LP 380–6 GJ 1179 A (M5.5 V) 13 48 13.41 +23 36 48.8 16 Mar. 2012e 2  ×  90 1.17 1.3 Thick
LP 731–58 GJ 3622 (M6.5 V) 10 48 12.58 –11 20 08.2 22 Mar. 2012 2  ×  60 1.33  ≳1.6 Thick

Notes. Asterisks mark our main targets.

(a)

Atmospheric conditions – Clear: clear sky, but with some rare clouds; Thin: thin cirrus, inducing absorption up to 0.2 mag; Thick: cloudy, inducing absorption over 0.2 mag.

(b)

Mayrit 180277 was also observed on 06 Mar. 2012 at airmass of 1.25 for 900 s with the volume-phase holographic grating R2500V (R ~ 1400, Δλ ~ 4400–6000 Å).

(c)

The spectrum of Mayrit 872139 was flagged as of poor quality (“PQC”) during the quality control due to the high air mass of the observation and the faintness of the target.

(d)

The full alternative name of Mayrit 1196092 is [BMZ2001] S Ori J054004.5–023642.

(e)

These were the notes in the William Herschel Telescope observing log for the night of 16 Mar. 2012: “strong extinction through clouds most of the night [...]”.

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