Standard Stars

Last update: October 2022

This page contains separate lists for each type of standard star; telluric, radial velocity, and transmission. Select the desired table from the list below. Part of these stars are followed as part of the SPIRou calibration plan. Others are shown for reference and can be used by PIs for additional calibration.

Telluric Calibration Stars

Radial Velocity Standard Stars

Transmission & Polarimetric Calibration Stars

Table 1: Telluric Calibration Stars

List Compiled by Etienne Artigau. Additional stellar data added by Cam Wipper.

These stars were identified using the following Simbad search parameters:

• 'V' band Magnitude between 3.0 and 6.0.
• Spectral Type between A0 and A9.
• v sin i > 200 km/s
• Not known to be a binary (resolved or spectroscopic).
• Not flagged as an emission line object in Simbad.
• Not known to be a variable star.
• Matched to the 2MASS catalog.
• North of -30 Declination.

This resulted in 62 stars meeting the above criteria. Then a first visit with SPIRou allowed to reject several stars, which spectra showed stellar emission features, SB signatures, or non-appropriate rotational profiles. The stars currently observed in the SPIRou calibration plan are listed in the table below, by RA bin.
RA Bin: 00-03  •  03-06  •  06-09  •  09-12  •  12-15  •  15-18  •  18-21  •  21-24

The raw criteria search was "[ rot.vsini >=200 & sptypes<='A9' & sptypes>='A0' & Vmag>=3 & Vmag<=6 ]"

Please note, all T_eff values for listed dwarf stars are estimated from
A Modern Mean Stellar Color and Effective Temperature Sequence for O9V-Y0V Dwarf Stars
by Eric Mamajek of the University of Rochester (version 2014.09.2), unless otherwise noted with an asterisk (*).

Table 1A: RA Bin 00-03

Table 1B: RA Bin 03-06

Table 1C: RA Bin 06-09

Table 1D: RA Bin 09-12

Table 1E: RA Bin 12-15

Table 1F: RA Bin 15-18

Table 1G: RA Bin 18-21

Table 1H: RA Bin 21-24

References for T_eff for non-dwarf stars

• zet Lep
• 24 Lyn
• bet Ser
• gam Sct

Table 2: Radial Velocity Standard Stars

List Complied by Claire Moutou, et al; MNRAS (2017). Additional stellar data added by Cam Wipper, Pascal Fouqué, and Luc Arnold.

Due to the amount of data on these stars, the relevant information is divided between two different tables.

UPDATE: Radial Velocity Standards changed for Semester 2022B

Starting in 2022B, the list of Radial Velocity standards has changed. The RV stability of some of the previous standards was deemed insufficient. Those stars have been removed from the list and replaced with more stable stars. Both sets of radial velocity standards are shown below.

2022B & Later Radial Velocity Standards

• Table 2A: Coordinates & Magnitudes
• Table 2B: Radial Velocities & Planets

Table 2A: Coordinates & Magnitudes

Table 2B: Radial Velocities & Planets

Pre-2022B Radial Velocity Standards

Table 2C: Coordinates & Magnitudes

Table 2D: Radial Velocities & Planets

Extra References for Radial Velocity Standards

• ^ - Based on ESPaDOnS data.
• * - Based on SPIRou data.

Table 3: Transmission & Polarimetric** Calibration Stars

List Complied by Cam Wipper, with assistance from Pascal Fouqué.

**Polarimetric Information Not Yet Determined

An initial list of stars were identified as meeting the following criteria:

• 'H' band Magnitude of 4.5 or brighter.
• Declination between -20 and +60.
• Proper Motion of ~200 mas/yr or lower.
• Spectral Type between A0 and M9.
• Luminosity Class V (Main Sequence Stars)
• Not known to be variable stars or part of binary/multiple star systems

This resulted in 78 stars meeting the above criteria.
The raw criteria search was "[ Hmag < 4.5 & dec > -20 & dec < 60 & pm < 300 & sptypes = 'XXX' ]".
The results were then manually sorted.

Finally, one star from each spectral class (B, A, F, G, K and M) was selected from each three-hour RA bin
to serve as the spectral type standard star for that RA bin. Additional stars were added if the initial list did not have a particular
spectral type in an RA bin--these additional stars may not meet all of the criteria listed above.

Please note, all T_eff values for listed dwarf stars are estimated from
A Modern Mean Stellar Color and Effective Temperature Sequence for O9V-Y0V Dwarf Stars
by Eric Mamajek of the University of Rochester (version 2014.09.2), unless otherwise noted with an asterisk (*).

^ : M-dwarfs observed with ESPaDOnS.

The selected stars are listed below by RA bin.
RA Bin: 00-03  •  03-06  •  06-09  •  09-12  •  12-15  •  15-18  •  18-21  •  21-24

Table 3A: RA Bin 00-03

Table 3B: RA Bin 03-06

Table 3C: RA Bin 06-09

Table 3D: RA Bin 09-12

Table 3E: RA Bin 12-15

Table 3F: RA Bin 15-18

Table 3G: RA Bin 18-21

Table 3H: RA Bin 21-24